Algebra Examples

${(2 r - 3 s)}^{3} + t^{9}$

Step 1

Rewrite $t^{9}$ as ${(t^{3})}^{3}$ .

${(2 r - 3 s)}^{3} + {(t^{3})}^{3}$

Step 2

Since both terms are perfect cubes, factor using the sum of cubes formula, $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ where $a = 2 r - 3 s$ and $b = t^{3}$ .

$(2 r - 3 s + t^{3}) ({(2 r - 3 s)}^{2} - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3

Simplify.

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Step 3.1

Rewrite ${(2 r - 3 s)}^{2}$ as $(2 r - 3 s) (2 r - 3 s)$ .

$(2 r - 3 s + t^{3}) ((2 r - 3 s) (2 r - 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.2

Expand $(2 r - 3 s) (2 r - 3 s)$ using the FOIL Method.

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Step 3.2.1

Apply the distributive property.

$(2 r - 3 s + t^{3}) (2 r (2 r - 3 s) - 3 s (2 r - 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.2.2

Apply the distributive property.

$(2 r - 3 s + t^{3}) (2 r (2 r) + 2 r (- 3 s) - 3 s (2 r - 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.2.3

Apply the distributive property.

$(2 r - 3 s + t^{3}) (2 r (2 r) + 2 r (- 3 s) - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3

Simplify and combine like terms.

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Step 3.3.1

Simplify each term.

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Step 3.3.1.1

Rewrite using the commutative property of multiplication.

$(2 r - 3 s + t^{3}) (2 \cdot 2 r \cdot r + 2 r (- 3 s) - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.2

Multiply $r$ by $r$ by adding the exponents.

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Step 3.3.1.2.1

Move $r$ .

$(2 r - 3 s + t^{3}) (2 \cdot 2 (r \cdot r) + 2 r (- 3 s) - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.2.2

Multiply $r$ by $r$ .

$(2 r - 3 s + t^{3}) (2 \cdot 2 r^{2} + 2 r (- 3 s) - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.3

Multiply $2$ by $2$ .

$(2 r - 3 s + t^{3}) (4 r^{2} + 2 r (- 3 s) - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.4

Rewrite using the commutative property of multiplication.

$(2 r - 3 s + t^{3}) (4 r^{2} + 2 \cdot - 3 r s - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.5

Multiply $2$ by $- 3$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 3 s (2 r) - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.6

Rewrite using the commutative property of multiplication.

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 3 \cdot 2 s r - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.7

Multiply $- 3$ by $2$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 6 s r - 3 s (- 3 s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.8

Rewrite using the commutative property of multiplication.

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 6 s r - 3 \cdot - 3 s \cdot s - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.9

Multiply $s$ by $s$ by adding the exponents.

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Step 3.3.1.9.1

Move $s$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 6 s r - 3 \cdot - 3 (s \cdot s) - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.9.2

Multiply $s$ by $s$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 6 s r - 3 \cdot - 3 s^{2} - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.1.10

Multiply $- 3$ by $- 3$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 6 s r + 9 s^{2} - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.2

Subtract $6 s r$ from $- 6 r s$ .

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Step 3.3.2.1

Move $s$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 6 r s - 6 r s + 9 s^{2} - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.3.2.2

Subtract $6 r s$ from $- 6 r s$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} - (2 r - 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.4

Apply the distributive property.

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} + (- (2 r) - (- 3 s)) t^{3} + {(t^{3})}^{2})$

Step 3.5

Multiply $2$ by $- 1$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} + (- 2 r - (- 3 s)) t^{3} + {(t^{3})}^{2})$

Step 3.6

Multiply $- 3$ by $- 1$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} + (- 2 r + 3 s) t^{3} + {(t^{3})}^{2})$

Step 3.7

Apply the distributive property.

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} - 2 r t^{3} + 3 s t^{3} + {(t^{3})}^{2})$

Step 3.8

Multiply the exponents in ${(t^{3})}^{2}$ .

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Step 3.8.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} - 2 r t^{3} + 3 s t^{3} + t^{3 \cdot 2})$

Step 3.8.2

Multiply $3$ by $2$ .

$(2 r - 3 s + t^{3}) (4 r^{2} - 12 r s + 9 s^{2} - 2 r t^{3} + 3 s t^{3} + t^{6})$