Algebra Examples

$(a x + 3) (5 x^{2} - b x + 4) = 20 x^{3} - 9 x^{2} - 2 x + 12$

Step 1

Divide each term in $(a x + 3) (5 x^{2} - b x + 4) = 20 x^{3} - 9 x^{2} - 2 x + 12$ by $5 x^{2} - b x + 4$ and simplify.

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Step 1.1

Divide each term in $(a x + 3) (5 x^{2} - b x + 4) = 20 x^{3} - 9 x^{2} - 2 x + 12$ by $5 x^{2} - b x + 4$ .

$\frac{(a x + 3) (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4} = \frac{20 x^{3}}{5 x^{2} - b x + 4} + \frac{- 9 x^{2}}{5 x^{2} - b x + 4} + \frac{- 2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.2

Simplify the left side.

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Step 1.2.1

Cancel the common factor of $5 x^{2} - b x + 4$ .

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Step 1.2.1.1

Cancel the common factor.

$\frac{(a x + 3) (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4} = \frac{20 x^{3}}{5 x^{2} - b x + 4} + \frac{- 9 x^{2}}{5 x^{2} - b x + 4} + \frac{- 2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.2.1.2

Divide $a x + 3$ by $1$ .

$a x + 3 = \frac{20 x^{3}}{5 x^{2} - b x + 4} + \frac{- 9 x^{2}}{5 x^{2} - b x + 4} + \frac{- 2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3

Simplify the right side.

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Step 1.3.1

Simplify terms.

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Step 1.3.1.1

Simplify each term.

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Step 1.3.1.1.1

Move the negative in front of the fraction.

$a x + 3 = \frac{20 x^{3}}{5 x^{2} - b x + 4} - \frac{(9) x^{2}}{5 x^{2} - b x + 4} + \frac{- 2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.1.1.2

Move the negative in front of the fraction.

$a x + 3 = \frac{20 x^{3}}{5 x^{2} - b x + 4} - \frac{9 x^{2}}{5 x^{2} - b x + 4} - \frac{2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.1.2

Simplify terms.

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Step 1.3.1.2.1

Combine the numerators over the common denominator.

$a x + 3 = \frac{20 x^{3} - 9 x^{2}}{5 x^{2} - b x + 4} - \frac{2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.1.2.2

Factor $x^{2}$ out of $20 x^{3} - 9 x^{2}$ .

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Step 1.3.1.2.2.1

Factor $x^{2}$ out of $20 x^{3}$ .

$a x + 3 = \frac{x^{2} (20 x) - 9 x^{2}}{5 x^{2} - b x + 4} - \frac{2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.1.2.2.2

Factor $x^{2}$ out of $- 9 x^{2}$ .

$a x + 3 = \frac{x^{2} (20 x) + x^{2} \cdot - 9}{5 x^{2} - b x + 4} - \frac{2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.1.2.2.3

Factor $x^{2}$ out of $x^{2} (20 x) + x^{2} \cdot - 9$ .

$a x + 3 = \frac{x^{2} (20 x - 9)}{5 x^{2} - b x + 4} - \frac{2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.1.2.3

Combine the numerators over the common denominator.

$a x + 3 = \frac{x^{2} (20 x - 9) - 2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2

Simplify the numerator.

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Step 1.3.2.1

Factor $x$ out of $x^{2} (20 x - 9) - 2 x$ .

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Step 1.3.2.1.1

Factor $x$ out of $x^{2} (20 x - 9)$ .

$a x + 3 = \frac{x (x (20 x - 9)) - 2 x}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.1.2

Factor $x$ out of $- 2 x$ .

$a x + 3 = \frac{x (x (20 x - 9)) + x \cdot - 2}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.1.3

Factor $x$ out of $x (x (20 x - 9)) + x \cdot - 2$ .

$a x + 3 = \frac{x (x (20 x - 9) - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.2

Apply the distributive property.

$a x + 3 = \frac{x (x (20 x) + x \cdot - 9 - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.3

Rewrite using the commutative property of multiplication.

$a x + 3 = \frac{x (20 x \cdot x + x \cdot - 9 - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.4

Move $- 9$ to the left of $x$ .

$a x + 3 = \frac{x (20 x \cdot x - 9 \cdot x - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.5

Multiply $x$ by $x$ by adding the exponents.

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Step 1.3.2.5.1

Move $x$ .

$a x + 3 = \frac{x (20 (x \cdot x) - 9 \cdot x - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.2.5.2

Multiply $x$ by $x$ .

$a x + 3 = \frac{x (20 x^{2} - 9 \cdot x - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

$a x + 3 = \frac{x (20 x^{2} - 9 x - 2)}{5 x^{2} - b x + 4} + \frac{12}{5 x^{2} - b x + 4}$

Step 1.3.3

Combine the numerators over the common denominator.

$a x + 3 = \frac{x (20 x^{2} - 9 x - 2) + 12}{5 x^{2} - b x + 4}$

Step 1.3.4

Simplify the numerator.

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Step 1.3.4.1

Apply the distributive property.

$a x + 3 = \frac{x (20 x^{2}) + x (- 9 x) + x \cdot - 2 + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.2

Simplify.

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Step 1.3.4.2.1

Rewrite using the commutative property of multiplication.

$a x + 3 = \frac{20 x \cdot x^{2} + x (- 9 x) + x \cdot - 2 + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.2.2

Rewrite using the commutative property of multiplication.

$a x + 3 = \frac{20 x \cdot x^{2} - 9 x \cdot x + x \cdot - 2 + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.2.3

Move $- 2$ to the left of $x$ .

$a x + 3 = \frac{20 x \cdot x^{2} - 9 x \cdot x - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.3

Simplify each term.

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Step 1.3.4.3.1

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 1.3.4.3.1.1

Move $x^{2}$ .

$a x + 3 = \frac{20 (x^{2} x) - 9 x \cdot x - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.3.1.2

Multiply $x^{2}$ by $x$ .

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Step 1.3.4.3.1.2.1

Raise $x$ to the power of $1$ .

$a x + 3 = \frac{20 (x^{2} x^{1}) - 9 x \cdot x - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.3.1.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$a x + 3 = \frac{20 x^{2 + 1} - 9 x \cdot x - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.3.1.3

Add $2$ and $1$ .

$a x + 3 = \frac{20 x^{3} - 9 x \cdot x - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.3.2

Multiply $x$ by $x$ by adding the exponents.

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Step 1.3.4.3.2.1

Move $x$ .

$a x + 3 = \frac{20 x^{3} - 9 (x \cdot x) - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.3.2.2

Multiply $x$ by $x$ .

$a x + 3 = \frac{20 x^{3} - 9 x^{2} - 2 \cdot x + 12}{5 x^{2} - b x + 4}$

$a x + 3 = \frac{20 x^{3} - 9 x^{2} - 2 x + 12}{5 x^{2} - b x + 4}$

Step 1.3.4.4

Factor $20 x^{3} - 9 x^{2} - 2 x + 12$ using the rational roots test.

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Step 1.3.4.4.1

If a polynomial function has integer coefficients, then every rational zero will have the form $\frac{p}{q}$ where $p$ is a factor of the constant and $q$ is a factor of the leading coefficient.

$p = \pm 1, \pm 12, \pm 2, \pm 6, \pm 3, \pm 4$

$q = \pm 1, \pm 20, \pm 2, \pm 10, \pm 4, \pm 5$

Step 1.3.4.4.2

Find every combination of $\pm \frac{p}{q}$ . These are the possible roots of the polynomial function.

$\pm 1, \pm 0.05, \pm 0.5, \pm 0.1, \pm 0.25, \pm 0.2, \pm 12, \pm 0.6, \pm 6, \pm 1.2, \pm 3, \pm 2.4, \pm 2, \pm 0.4, \pm 0.3, \pm 1.5, \pm 0.15, \pm 0.75, \pm 4, \pm 0.8$

Step 1.3.4.4.3

Substitute $- 0.75$ and simplify the expression. In this case, the expression is equal to $0$ so $- 0.75$ is a root of the polynomial.

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Step 1.3.4.4.3.1

Substitute $- 0.75$ into the polynomial.

$20 {(- 0.75)}^{3} - 9 {(- 0.75)}^{2} - 2 \cdot - 0.75 + 12$

Step 1.3.4.4.3.2

Raise $- 0.75$ to the power of $3$ .

$20 \cdot - 0.421875 - 9 {(- 0.75)}^{2} - 2 \cdot - 0.75 + 12$

Step 1.3.4.4.3.3

Multiply $20$ by $- 0.421875$ .

$- 8.4375 - 9 {(- 0.75)}^{2} - 2 \cdot - 0.75 + 12$

Step 1.3.4.4.3.4

Raise $- 0.75$ to the power of $2$ .

$- 8.4375 - 9 \cdot 0.5625 - 2 \cdot - 0.75 + 12$

Step 1.3.4.4.3.5

Multiply $- 9$ by $0.5625$ .

$- 8.4375 - 5.0625 - 2 \cdot - 0.75 + 12$

Step 1.3.4.4.3.6

Subtract $5.0625$ from $- 8.4375$ .

$- 13.5 - 2 \cdot - 0.75 + 12$

Step 1.3.4.4.3.7

Multiply $- 2$ by $- 0.75$ .

$- 13.5 + 1.5 + 12$

Step 1.3.4.4.3.8

Add $- 13.5$ and $1.5$ .

$- 12 + 12$

Step 1.3.4.4.3.9

Add $- 12$ and $12$ .

$0$

Step 1.3.4.4.4

Since $- 0.75$ is a known root, divide the polynomial by $4 x + 3$ to find the quotient polynomial. This polynomial can then be used to find the remaining roots.

$\frac{20 x^{3} - 9 x^{2} - 2 x + 12}{4 x + 3}$

Step 1.3.4.4.5

Divide $20 x^{3} - 9 x^{2} - 2 x + 12$ by $4 x + 3$ .

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Step 1.3.4.4.5.1

Set up the polynomials to be divided. If there is not a term for every exponent, insert one with a value of $0$ .

$4 x$

$3$

$20 x^{3}$

$9 x^{2}$

$2 x$

$12$

Step 1.3.4.4.5.2

Divide the highest order term in the dividend $20 x^{3}$ by the highest order term in divisor $4 x$ .

					$5 x^{2}$
	$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$

Step 1.3.4.4.5.3

Multiply the new quotient term by the divisor.

				$5 x^{2}$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			+	$20 x^{3}$	+	$15 x^{2}$

Step 1.3.4.4.5.4

The expression needs to be subtracted from the dividend, so change all the signs in $20 x^{3} + 15 x^{2}$

				$5 x^{2}$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$

Step 1.3.4.4.5.5

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$5 x^{2}$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$

Step 1.3.4.4.5.6

Pull the next terms from the original dividend down into the current dividend.

				$5 x^{2}$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$

Step 1.3.4.4.5.7

Divide the highest order term in the dividend $- 24 x^{2}$ by the highest order term in divisor $4 x$ .

				$5 x^{2}$	-	$6 x$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$

Step 1.3.4.4.5.8

Multiply the new quotient term by the divisor.

				$5 x^{2}$	-	$6 x$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					-	$24 x^{2}$	-	$18 x$

Step 1.3.4.4.5.9

The expression needs to be subtracted from the dividend, so change all the signs in $- 24 x^{2} - 18 x$

				$5 x^{2}$	-	$6 x$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$

Step 1.3.4.4.5.10

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$5 x^{2}$	-	$6 x$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$
							+	$16 x$

Step 1.3.4.4.5.11

Pull the next terms from the original dividend down into the current dividend.

				$5 x^{2}$	-	$6 x$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$
							+	$16 x$	+	$12$

Step 1.3.4.4.5.12

Divide the highest order term in the dividend $16 x$ by the highest order term in divisor $4 x$ .

				$5 x^{2}$	-	$6 x$	+	$4$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$
							+	$16 x$	+	$12$

Step 1.3.4.4.5.13

Multiply the new quotient term by the divisor.

				$5 x^{2}$	-	$6 x$	+	$4$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$
							+	$16 x$	+	$12$
							+	$16 x$	+	$12$

Step 1.3.4.4.5.14

The expression needs to be subtracted from the dividend, so change all the signs in $16 x + 12$

				$5 x^{2}$	-	$6 x$	+	$4$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$
							+	$16 x$	+	$12$
							-	$16 x$	-	$12$

Step 1.3.4.4.5.15

After changing the signs, add the last dividend from the multiplied polynomial to find the new dividend.

				$5 x^{2}$	-	$6 x$	+	$4$
$4 x$	+	$3$		$20 x^{3}$	-	$9 x^{2}$	-	$2 x$	+	$12$
			-	$20 x^{3}$	-	$15 x^{2}$
					-	$24 x^{2}$	-	$2 x$
					+	$24 x^{2}$	+	$18 x$
							+	$16 x$	+	$12$
							-	$16 x$	-	$12$
										$0$

Step 1.3.4.4.5.16

Since the remander is $0$ , the final answer is the quotient.

$5 x^{2} - 6 x + 4$

Step 1.3.4.4.6

Write $20 x^{3} - 9 x^{2} - 2 x + 12$ as a set of factors.

$a x + 3 = \frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4}$

Step 2

Subtract $3$ from both sides of the equation.

$a x = \frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4} - 3$

Step 3

Divide each term in $a x = \frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4} - 3$ by $x$ and simplify.

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Step 3.1

Divide each term in $a x = \frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4} - 3$ by $x$ .

$\frac{a x}{x} = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4}}{x} + \frac{- 3}{x}$

Step 3.2

Simplify the left side.

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Step 3.2.1

Cancel the common factor of $x$ .

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Step 3.2.1.1

Cancel the common factor.

$\frac{a x}{x} = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4}}{x} + \frac{- 3}{x}$

Step 3.2.1.2

Divide $a$ by $1$ .

$a = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4}}{x} + \frac{- 3}{x}$

Step 3.3

Simplify the right side.

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Step 3.3.1

Combine the numerators over the common denominator.

$a = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4} - 3}{x}$

Step 3.3.2

To write $- 3$ as a fraction with a common denominator, multiply by $\frac{5 x^{2} - b x + 4}{5 x^{2} - b x + 4}$ .

$a = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4} - 3 \cdot \frac{5 x^{2} - b x + 4}{5 x^{2} - b x + 4}}{x}$

Step 3.3.3

Simplify terms.

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Step 3.3.3.1

Combine $- 3$ and $\frac{5 x^{2} - b x + 4}{5 x^{2} - b x + 4}$ .

$a = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4)}{5 x^{2} - b x + 4} + \frac{- 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.3.2

Combine the numerators over the common denominator.

$a = \frac{\frac{(4 x + 3) (5 x^{2} - 6 x + 4) - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4

Simplify the numerator.

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Step 3.3.4.1

Expand $(4 x + 3) (5 x^{2} - 6 x + 4)$ by multiplying each term in the first expression by each term in the second expression.

$a = \frac{\frac{4 x (5 x^{2}) + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2

Simplify each term.

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Step 3.3.4.2.1

Rewrite using the commutative property of multiplication.

$a = \frac{\frac{4 \cdot 5 x \cdot x^{2} + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.2

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 3.3.4.2.2.1

Move $x^{2}$ .

$a = \frac{\frac{4 \cdot 5 (x^{2} x) + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.2.2

Multiply $x^{2}$ by $x$ .

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Step 3.3.4.2.2.2.1

Raise $x$ to the power of $1$ .

$a = \frac{\frac{4 \cdot 5 (x^{2} x^{1}) + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.2.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$a = \frac{\frac{4 \cdot 5 x^{2 + 1} + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.2.3

Add $2$ and $1$ .

$a = \frac{\frac{4 \cdot 5 x^{3} + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.3

Multiply $4$ by $5$ .

$a = \frac{\frac{20 x^{3} + 4 x (- 6 x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.4

Rewrite using the commutative property of multiplication.

$a = \frac{\frac{20 x^{3} + 4 \cdot - 6 x \cdot x + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.5

Multiply $x$ by $x$ by adding the exponents.

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Step 3.3.4.2.5.1

Move $x$ .

$a = \frac{\frac{20 x^{3} + 4 \cdot - 6 (x \cdot x) + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.5.2

Multiply $x$ by $x$ .

$a = \frac{\frac{20 x^{3} + 4 \cdot - 6 x^{2} + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.6

Multiply $4$ by $- 6$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} + 4 x \cdot 4 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.7

Multiply $4$ by $4$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} + 16 x + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.8

Multiply $5$ by $3$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} + 16 x + 15 x^{2} + 3 (- 6 x) + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.9

Multiply $- 6$ by $3$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} + 16 x + 15 x^{2} - 18 x + 3 \cdot 4 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.2.10

Multiply $3$ by $4$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} + 16 x + 15 x^{2} - 18 x + 12 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.3

Add $- 24 x^{2}$ and $15 x^{2}$ .

$a = \frac{\frac{20 x^{3} - 9 x^{2} + 16 x - 18 x + 12 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.4

Subtract $18 x$ from $16 x$ .

$a = \frac{\frac{20 x^{3} - 9 x^{2} - 2 x + 12 - 3 (5 x^{2} - b x + 4)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.5

Apply the distributive property.

$a = \frac{\frac{20 x^{3} - 9 x^{2} - 2 x + 12 - 3 (5 x^{2}) - 3 (- b x) - 3 \cdot 4}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.6

Simplify.

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Step 3.3.4.6.1

Multiply $5$ by $- 3$ .

$a = \frac{\frac{20 x^{3} - 9 x^{2} - 2 x + 12 - 15 x^{2} - 3 (- b x) - 3 \cdot 4}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.6.2

Multiply $- 1$ by $- 3$ .

$a = \frac{\frac{20 x^{3} - 9 x^{2} - 2 x + 12 - 15 x^{2} + 3 (b x) - 3 \cdot 4}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.6.3

Multiply $- 3$ by $4$ .

$a = \frac{\frac{20 x^{3} - 9 x^{2} - 2 x + 12 - 15 x^{2} + 3 (b x) - 12}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.7

Subtract $15 x^{2}$ from $- 9 x^{2}$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} - 2 x + 12 + 3 b x - 12}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.8

Subtract $12$ from $12$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} - 2 x + 3 b x + 0}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.9

Add $20 x^{3} - 24 x^{2} - 2 x + 3 b x$ and $0$ .

$a = \frac{\frac{20 x^{3} - 24 x^{2} - 2 x + 3 b x}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10

Factor $x$ out of $20 x^{3} - 24 x^{2} - 2 x + 3 b x$ .

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Step 3.3.4.10.1

Factor $x$ out of $20 x^{3}$ .

$a = \frac{\frac{x (20 x^{2}) - 24 x^{2} - 2 x + 3 b x}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10.2

Factor $x$ out of $- 24 x^{2}$ .

$a = \frac{\frac{x (20 x^{2}) + x (- 24 x) - 2 x + 3 b x}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10.3

Factor $x$ out of $- 2 x$ .

$a = \frac{\frac{x (20 x^{2}) + x (- 24 x) + x \cdot - 2 + 3 b x}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10.4

Factor $x$ out of $3 b x$ .

$a = \frac{\frac{x (20 x^{2}) + x (- 24 x) + x \cdot - 2 + x (3 b)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10.5

Factor $x$ out of $x (20 x^{2}) + x (- 24 x)$ .

$a = \frac{\frac{x (20 x^{2} - 24 x) + x \cdot - 2 + x (3 b)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10.6

Factor $x$ out of $x (20 x^{2} - 24 x) + x \cdot - 2$ .

$a = \frac{\frac{x (20 x^{2} - 24 x - 2) + x (3 b)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.4.10.7

Factor $x$ out of $x (20 x^{2} - 24 x - 2) + x (3 b)$ .

$a = \frac{\frac{x (20 x^{2} - 24 x - 2 + 3 b)}{5 x^{2} - b x + 4}}{x}$

Step 3.3.5

Multiply the numerator by the reciprocal of the denominator.

$a = \frac{x (20 x^{2} - 24 x - 2 + 3 b)}{5 x^{2} - b x + 4} \cdot \frac{1}{x}$

Step 3.3.6

Cancel the common factor of $x$ .

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Step 3.3.6.1

Cancel the common factor.

$a = \frac{x (20 x^{2} - 24 x - 2 + 3 b)}{5 x^{2} - b x + 4} \cdot \frac{1}{x}$

Step 3.3.6.2

Rewrite the expression.

$a = \frac{20 x^{2} - 24 x - 2 + 3 b}{5 x^{2} - b x + 4}$