Algebra Examples

$f (x) = b {(x + a)}^{3} + c$

Step 1

Write $f (x) = b {(x + a)}^{3} + c$ as an equation.

$y = b {(x + a)}^{3} + c$

Step 2

Interchange the variables.

$b = y {(x + a)}^{3} + c$

Step 3

Solve for $y$ .

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Step 3.1

Rewrite the equation as $y {(x + a)}^{3} + c = b$ .

$y {(x + a)}^{3} + c = b$

Step 3.2

Subtract $c$ from both sides of the equation.

$y {(x + a)}^{3} = b - c$

Step 3.3

Divide each term in $y {(x + a)}^{3} = b - c$ by ${(x + a)}^{3}$ and simplify.

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Step 3.3.1

Divide each term in $y {(x + a)}^{3} = b - c$ by ${(x + a)}^{3}$ .

$\frac{y {(x + a)}^{3}}{{(x + a)}^{3}} = \frac{b}{{(x + a)}^{3}} + \frac{- c}{{(x + a)}^{3}}$

Step 3.3.2

Simplify the left side.

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Step 3.3.2.1

Cancel the common factor of ${(x + a)}^{3}$ .

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Step 3.3.2.1.1

Cancel the common factor.

$\frac{y {(x + a)}^{3}}{{(x + a)}^{3}} = \frac{b}{{(x + a)}^{3}} + \frac{- c}{{(x + a)}^{3}}$

Step 3.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{b}{{(x + a)}^{3}} + \frac{- c}{{(x + a)}^{3}}$

Step 3.3.3

Simplify the right side.

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Step 3.3.3.1

Move the negative in front of the fraction.

$y = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 4

Replace $y$ with $f^{- 1} (b)$ to show the final answer.

$f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5

Verify if $f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$ is the inverse of $f (b) = b {(x + a)}^{3} + c$ .

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Step 5.1

To verify the inverse, check if $f^{- 1} (f (b)) = b$ and $f (f^{- 1} (b)) = b$ .

Step 5.2

Evaluate $f^{- 1} (f (b))$ .

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Step 5.2.1

Set up the composite result function.

$f^{- 1} (f (b))$

Step 5.2.2

Evaluate $f^{- 1} (b {(x + a)}^{3} + c)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b {(x + a)}^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5.2.3

Simplify the numerator.

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Step 5.2.3.1

Use the Binomial Theorem.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (x^{3} + 3 x^{2} a + 3 x a^{2} + a^{3}) + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5.2.3.2

Apply the distributive property.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + b (3 x^{2} a) + b (3 x a^{2}) + b a^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5.2.3.3

Simplify.

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Step 5.2.3.3.1

Rewrite using the commutative property of multiplication.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + b (3 x a^{2}) + b a^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5.2.3.3.2

Rewrite using the commutative property of multiplication.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5.2.4

Simplify terms.

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Step 5.2.4.1

Combine the numerators over the common denominator.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + c - c}{{(a + x)}^{3}}$

Step 5.2.4.2

Combine the opposite terms in $b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + c - c$ .

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Step 5.2.4.2.1

Subtract $c$ from $c$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + 0}{{(a + x)}^{3}}$

Step 5.2.4.2.2

Add $b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3}$ and $0$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3

Simplify the expression.

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Step 5.2.4.3.1

Move $x^{2}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b a x^{2} + 3 b x a^{2} + b a^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3.2

Move $b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 b x a^{2} + b a^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3.3

Move $x$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 b a^{2} x + b a^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3.4

Move $b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 a^{2} b x + b a^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3.5

Reorder $b$ and $a^{3}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 a^{2} b x + a^{3} b}{{(a + x)}^{3}}$

Step 5.2.4.3.6

Move $b x^{3}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{3 a b x^{2} + 3 a^{2} b x + a^{3} b + b x^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3.7

Move $3 a b x^{2}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{3 a^{2} b x + a^{3} b + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Step 5.2.4.3.8

Reorder $3 a^{2} b x$ and $a^{3} b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{a^{3} b + 3 a^{2} b x + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Step 5.2.4.4

Factor $b$ out of $a^{3} b + 3 a^{2} b x + 3 a b x^{2} + b x^{3}$ .

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Step 5.2.4.4.1

Factor $b$ out of $a^{3} b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + 3 a^{2} b x + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Step 5.2.4.4.2

Factor $b$ out of $3 a^{2} b x$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + b (3 a^{2} x) + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Step 5.2.4.4.3

Factor $b$ out of $3 a b x^{2}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + b (3 a^{2} x) + b (3 a x^{2}) + b x^{3}}{{(a + x)}^{3}}$

Step 5.2.4.4.4

Factor $b$ out of $b x^{3}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + b (3 a^{2} x) + b (3 a x^{2}) + b (x^{3})}{{(a + x)}^{3}}$

Step 5.2.4.4.5

Factor $b$ out of $b a^{3} + b (3 a^{2} x)$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (a^{3} + 3 a^{2} x) + b (3 a x^{2}) + b (x^{3})}{{(a + x)}^{3}}$

Step 5.2.4.4.6

Factor $b$ out of $b (a^{3} + 3 a^{2} x) + b (3 a x^{2})$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (a^{3} + 3 a^{2} x + 3 a x^{2}) + b (x^{3})}{{(a + x)}^{3}}$

Step 5.2.4.4.7

Factor $b$ out of $b (a^{3} + 3 a^{2} x + 3 a x^{2}) + b (x^{3})$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (a^{3} + 3 a^{2} x + 3 a x^{2} + x^{3})}{{(a + x)}^{3}}$

Step 5.3

Evaluate $f (f^{- 1} (b))$ .

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Step 5.3.1

Set up the composite result function.

$f (f^{- 1} (b))$

Step 5.3.2

Evaluate $f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) {(x + a)}^{3} + c$

Step 5.3.3

Simplify each term.

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Step 5.3.3.1

Use the Binomial Theorem.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) (x^{3} + 3 x^{2} a + 3 x a^{2} + a^{3}) + c$

Step 5.3.3.2

Expand $(\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) (x^{3} + 3 x^{2} a + 3 x a^{2} + a^{3})$ by multiplying each term in the first expression by each term in the second expression.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b}{{(x + a)}^{3}} \cdot x^{3} + \frac{b}{{(x + a)}^{3}} \cdot (3 x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3

Simplify each term.

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Step 5.3.3.3.1

Combine $\frac{b}{{(x + a)}^{3}}$ and $x^{3}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot (3 x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.2

Rewrite using the commutative property of multiplication.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + 3 (\frac{b}{{(x + a)}^{3}}) \cdot (x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.3

Combine $3$ and $\frac{b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 b}{{(x + a)}^{3}} \cdot (x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.4

Multiply $\frac{3 b}{{(x + a)}^{3}} (x^{2} a)$ .

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Step 5.3.3.3.4.1

Combine $x^{2}$ and $\frac{3 b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{x^{2} (3 b)}{{(x + a)}^{3}} \cdot a + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.4.2

Combine $\frac{x^{2} (3 b)}{{(x + a)}^{3}}$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{x^{2} (3 b) a}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.5

Move $3$ to the left of $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 \cdot (x^{2} b a)}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.6

Rewrite using the commutative property of multiplication.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + 3 (\frac{b}{{(x + a)}^{3}}) \cdot (x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.7

Combine $3$ and $\frac{b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 b}{{(x + a)}^{3}} \cdot (x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.8

Multiply $\frac{3 b}{{(x + a)}^{3}} (x a^{2})$ .

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Step 5.3.3.3.8.1

Combine $x$ and $\frac{3 b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{x (3 b)}{{(x + a)}^{3}} \cdot a^{2} + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.8.2

Combine $\frac{x (3 b)}{{(x + a)}^{3}}$ and $a^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{x (3 b) a^{2}}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.9

Move $3$ to the left of $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 \cdot (x b a^{2})}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.10

Combine $\frac{b}{{(x + a)}^{3}}$ and $a^{3}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.11

Combine $x^{3}$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.12

Multiply $- \frac{c}{{(x + a)}^{3}} (3 x^{2} a)$ .

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Step 5.3.3.3.12.1

Multiply $3$ by $- 1$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - 3 \frac{c}{{(x + a)}^{3}} \cdot (x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.12.2

Combine $- 3$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{- 3 c}{{(x + a)}^{3}} \cdot (x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.12.3

Combine $x^{2}$ and $\frac{- 3 c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{x^{2} (- 3 c)}{{(x + a)}^{3}} \cdot a - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.12.4

Combine $\frac{x^{2} (- 3 c)}{{(x + a)}^{3}}$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{x^{2} (- 3 c) a}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.13

Remove unnecessary parentheses.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{x^{2} \cdot (- 3 c a)}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.14

Move $- 3$ to the left of $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{- 3 \cdot (x^{2} c a)}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.15

Move the negative in front of the fraction.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{(3) \cdot (x^{2} c a)}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.16

Multiply $- \frac{c}{{(x + a)}^{3}} (3 x a^{2})$ .

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Step 5.3.3.3.16.1

Multiply $3$ by $- 1$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - 3 \frac{c}{{(x + a)}^{3}} \cdot (x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.16.2

Combine $- 3$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{- 3 c}{{(x + a)}^{3}} \cdot (x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.16.3

Combine $x$ and $\frac{- 3 c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{x (- 3 c)}{{(x + a)}^{3}} \cdot a^{2} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.16.4

Combine $\frac{x (- 3 c)}{{(x + a)}^{3}}$ and $a^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{x (- 3 c) a^{2}}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.17

Remove unnecessary parentheses.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{x \cdot (- 3 c a^{2})}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.18

Move $- 3$ to the left of $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{- 3 \cdot (x c a^{2})}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.19

Move the negative in front of the fraction.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{(3) \cdot (x c a^{2})}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Step 5.3.3.3.20

Combine $a^{3}$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4

Simplify the expression.

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Step 5.3.4.1

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.2

Move $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 b a x^{2}}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.3

Move $b$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.4

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.5

Move $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 b a^{2} x}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.6

Move $b$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.7

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.8

Reorder $b$ and $a^{3}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.9

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.10

Reorder $x^{3}$ and $c$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.11

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.12

Move $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 c a x^{2}}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.13

Move $c$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.14

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.15

Move $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 c a^{2} x}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.16

Move $c$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 a^{2} c x}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.17

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 a^{2} c x}{{(a + x)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Step 5.3.4.18

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 a^{2} c x}{{(a + x)}^{3}} - \frac{a^{3} c}{{(a + x)}^{3}} + c$

Step 5.4

Since $f^{- 1} (f (b)) = b$ and $f (f^{- 1} (b)) = b$ , then $f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$ is the inverse of $f (b) = b {(x + a)}^{3} + c$ .

$f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$