Algebra Examples

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

Step 1

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

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

Step 2

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

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

Step 3

Simplify terms.

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Step 3.1

Simplify each term.

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Step 3.1.1

Rewrite using the commutative property of multiplication.

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

Step 3.1.2

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

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Step 3.1.2.1

Move $x^{2}$ .

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

Step 3.1.2.2

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

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

Step 3.1.2.3

Add $2$ and $2$ .

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

Step 3.1.3

Rewrite using the commutative property of multiplication.

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

Step 3.1.4

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

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Step 3.1.4.1

Move $x$ .

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

Step 3.1.4.2

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

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Step 3.1.4.2.1

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

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

Step 3.1.4.2.2

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

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

Step 3.1.4.3

Add $1$ and $2$ .

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

Step 3.1.5

Move $- 1$ to the left of $x^{2}$ .

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

Step 3.1.6

Rewrite $- 1 x^{2}$ as $- x^{2}$ .

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

Step 3.1.7

Rewrite using the commutative property of multiplication.

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

Step 3.1.8

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

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Step 3.1.8.1

Move $x^{2}$ .

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

Step 3.1.8.2

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

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Step 3.1.8.2.1

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

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

Step 3.1.8.2.2

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

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

Step 3.1.8.3

Add $2$ and $1$ .

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

Step 3.1.9

Rewrite using the commutative property of multiplication.

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

Step 3.1.10

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

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Step 3.1.10.1

Move $x$ .

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

Step 3.1.10.2

Multiply $x$ by $x$ .

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

Step 3.1.11

Move $- 1$ to the left of $x$ .

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

Step 3.1.12

Rewrite $- 1 x$ as $- x$ .

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

Step 3.1.13

Multiply $2$ by $2$ .

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

Step 3.1.14

Multiply $- 3$ by $2$ .

$2 x^{4} - 3 x^{3} - x^{2} + 2 x^{3} - 3 x^{2} - x + 4 x^{2} - 6 x + 2 \cdot - 1$

Step 3.1.15

Multiply $2$ by $- 1$ .

$2 x^{4} - 3 x^{3} - x^{2} + 2 x^{3} - 3 x^{2} - x + 4 x^{2} - 6 x - 2$

Step 3.2

Simplify by adding terms.

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Step 3.2.1

Add $- 3 x^{3}$ and $2 x^{3}$ .

$2 x^{4} - x^{3} - x^{2} - 3 x^{2} - x + 4 x^{2} - 6 x - 2$

Step 3.2.2

Subtract $3 x^{2}$ from $- x^{2}$ .

$2 x^{4} - x^{3} - 4 x^{2} - x + 4 x^{2} - 6 x - 2$

Step 3.2.3

Combine the opposite terms in $2 x^{4} - x^{3} - 4 x^{2} - x + 4 x^{2} - 6 x - 2$ .

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Step 3.2.3.1

Add $- 4 x^{2}$ and $4 x^{2}$ .

$2 x^{4} - x^{3} - x + 0 - 6 x - 2$

Step 3.2.3.2

Add $2 x^{4} - x^{3} - x$ and $0$ .

$2 x^{4} - x^{3} - x - 6 x - 2$

Step 3.2.4

Subtract $6 x$ from $- x$ .

$2 x^{4} - x^{3} - 7 x - 2$