Algebra Examples

(- 2 x^{2} + 3 x - 1) (2 x^{2} + 3 x + 5)

$(- 2 x^{2} + 3 x - 1) (2 x^{2} + 3 x + 5)$

Step 1

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

a x^{2} + b x + c

$a x^{2} + b x + c$

Step 2

Expand

(- 2 x^{2} + 3 x - 1) (2 x^{2} + 3 x + 5)

$(- 2 x^{2} + 3 x - 1) (2 x^{2} + 3 x + 5)$ by multiplying each term in the first expression by each term in the second expression.

- 2 x^{2} (2 x^{2}) - 2 x^{2} (3 x) - 2 x^{2} \cdot 5 + 3 x (2 x^{2}) + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 x^{2} (3 x) - 2 x^{2} \cdot 5 + 3 x (2 x^{2}) + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3

Simplify terms.

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Step 3.1

Combine the opposite terms in

- 2 x^{2} (2 x^{2}) - 2 x^{2} (3 x) - 2 x^{2} \cdot 5 + 3 x (2 x^{2}) + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 x^{2} (3 x) - 2 x^{2} \cdot 5 + 3 x (2 x^{2}) + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$ .

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Step 3.1.1

Reorder the factors in the terms

- 2 x^{2} (3 x)

$- 2 x^{2} (3 x)$ and

3 x (2 x^{2})

$3 x (2 x^{2})$ .

- 2 x^{2} (2 x^{2}) - 2 \cdot 3 x^{2} x - 2 x^{2} \cdot 5 + 2 \cdot 3 x^{2} x + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 \cdot 3 x^{2} x - 2 x^{2} \cdot 5 + 2 \cdot 3 x^{2} x + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.1.2

Add

- 2 \cdot 3 x^{2} x

$- 2 \cdot 3 x^{2} x$ and

2 \cdot 3 x^{2} x

$2 \cdot 3 x^{2} x$ .

- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5 + 0 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5 + 0 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.1.3

Add

- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5$ and

0

$0$ .

- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 x^{2} (2 x^{2}) - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2

Simplify each term.

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Step 3.2.1

Rewrite using the commutative property of multiplication.

- 2 \cdot 2 x^{2} x^{2} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 \cdot 2 x^{2} x^{2} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.2

Multiply

x^{2}

$x^{2}$ by

x^{2}

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

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Step 3.2.2.1

Move

x^{2}

$x^{2}$ .

- 2 \cdot 2 (x^{2} x^{2}) - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 \cdot 2 (x^{2} x^{2}) - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.2.2

Use the power rule

a^{m} a^{n} = a^{m + n}

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

- 2 \cdot 2 x^{2 + 2} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 \cdot 2 x^{2 + 2} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.2.3

Add

2

$2$ and

2

$2$ .

- 2 \cdot 2 x^{4} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 \cdot 2 x^{4} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

- 2 \cdot 2 x^{4} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 2 \cdot 2 x^{4} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.3

Multiply

- 2

$- 2$ by

2

$2$ .

- 4 x^{4} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 2 x^{2} \cdot 5 + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.4

Multiply

5

$5$ by

- 2

$- 2$ .

- 4 x^{4} - 10 x^{2} + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 3 x (3 x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.5

Rewrite using the commutative property of multiplication.

- 4 x^{4} - 10 x^{2} + 3 \cdot 3 x \cdot x + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 3 \cdot 3 x \cdot x + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.6

Multiply

x

$x$ by

x

$x$ by adding the exponents.

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Step 3.2.6.1

Move

x

$x$ .

- 4 x^{4} - 10 x^{2} + 3 \cdot 3 (x \cdot x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 3 \cdot 3 (x \cdot x) + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.6.2

Multiply

x

$x$ by

x

$x$ .

- 4 x^{4} - 10 x^{2} + 3 \cdot 3 x^{2} + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 3 \cdot 3 x^{2} + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

- 4 x^{4} - 10 x^{2} + 3 \cdot 3 x^{2} + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 3 \cdot 3 x^{2} + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.7

Multiply

3

$3$ by

3

$3$ .

- 4 x^{4} - 10 x^{2} + 9 x^{2} + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 9 x^{2} + 3 x \cdot 5 - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.8

Multiply

5

$5$ by

3

$3$ .

- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 1 (2 x^{2}) - 1 (3 x) - 1 \cdot 5$

Step 3.2.9

Multiply

2

$2$ by

- 1

$- 1$ .

- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 1 (3 x) - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 1 (3 x) - 1 \cdot 5$

Step 3.2.10

Multiply

3

$3$ by

- 1

$- 1$ .

- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 3 x - 1 \cdot 5

$- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 3 x - 1 \cdot 5$

Step 3.2.11

Multiply

- 1

$- 1$ by

5

$5$ .

- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 3 x - 5

$- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 3 x - 5$

- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 3 x - 5

$- 4 x^{4} - 10 x^{2} + 9 x^{2} + 15 x - 2 x^{2} - 3 x - 5$

Step 3.3

Simplify by adding terms.

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Step 3.3.1

Add

- 10 x^{2}

$- 10 x^{2}$ and

9 x^{2}

$9 x^{2}$ .

- 4 x^{4} - x^{2} + 15 x - 2 x^{2} - 3 x - 5

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

Step 3.3.2

Subtract

2 x^{2}

$2 x^{2}$ from

- x^{2}

$- x^{2}$ .

- 4 x^{4} - 3 x^{2} + 15 x - 3 x - 5

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

Step 3.3.3

Subtract

3 x

$3 x$ from

15 x

$15 x$ .

- 4 x^{4} - 3 x^{2} + 12 x - 5

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

- 4 x^{4} - 3 x^{2} + 12 x - 5

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

- 4 x^{4} - 3 x^{2} + 12 x - 5

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