Algebra Examples

$(1 + 4 x + 3 x^{2}) (2 - 7 x - 9 x^{2})$

Step 1

Expand $(1 + 4 x + 3 x^{2}) (2 - 7 x - 9 x^{2})$ by multiplying each term in the first expression by each term in the second expression.

$1 \cdot 2 + 1 (- 7 x) + 1 (- 9 x^{2}) + 4 x \cdot 2 + 4 x (- 7 x) + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2

Simplify terms.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $2$ by $1$ .

$2 + 1 (- 7 x) + 1 (- 9 x^{2}) + 4 x \cdot 2 + 4 x (- 7 x) + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.2

Multiply $- 7 x$ by $1$ .

$2 - 7 x + 1 (- 9 x^{2}) + 4 x \cdot 2 + 4 x (- 7 x) + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.3

Multiply $- 9 x^{2}$ by $1$ .

$2 - 7 x - 9 x^{2} + 4 x \cdot 2 + 4 x (- 7 x) + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.4

Multiply $2$ by $4$ .

$2 - 7 x - 9 x^{2} + 8 x + 4 x (- 7 x) + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.5

Rewrite using the commutative property of multiplication.

$2 - 7 x - 9 x^{2} + 8 x + 4 \cdot - 7 x \cdot x + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.6

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

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Step 2.1.6.1

Move $x$ .

$2 - 7 x - 9 x^{2} + 8 x + 4 \cdot - 7 (x \cdot x) + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.6.2

Multiply $x$ by $x$ .

$2 - 7 x - 9 x^{2} + 8 x + 4 \cdot - 7 x^{2} + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.7

Multiply $4$ by $- 7$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} + 4 x (- 9 x^{2}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.8

Rewrite using the commutative property of multiplication.

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} + 4 \cdot - 9 x \cdot x^{2} + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.9

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

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Step 2.1.9.1

Move $x^{2}$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} + 4 \cdot - 9 (x^{2} x) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.9.2

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

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Step 2.1.9.2.1

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

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} + 4 \cdot - 9 (x^{2} x^{1}) + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.9.2.2

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

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} + 4 \cdot - 9 x^{2 + 1} + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.9.3

Add $2$ and $1$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} + 4 \cdot - 9 x^{3} + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.10

Multiply $4$ by $- 9$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 3 x^{2} \cdot 2 + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.11

Multiply $2$ by $3$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} + 3 x^{2} (- 7 x) + 3 x^{2} (- 9 x^{2})$

Step 2.1.12

Rewrite using the commutative property of multiplication.

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} + 3 \cdot - 7 x^{2} x + 3 x^{2} (- 9 x^{2})$

Step 2.1.13

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

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Step 2.1.13.1

Move $x$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} + 3 \cdot - 7 (x \cdot x^{2}) + 3 x^{2} (- 9 x^{2})$

Step 2.1.13.2

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

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Step 2.1.13.2.1

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

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} + 3 \cdot - 7 (x^{1} x^{2}) + 3 x^{2} (- 9 x^{2})$

Step 2.1.13.2.2

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

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} + 3 \cdot - 7 x^{1 + 2} + 3 x^{2} (- 9 x^{2})$

Step 2.1.13.3

Add $1$ and $2$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} + 3 \cdot - 7 x^{3} + 3 x^{2} (- 9 x^{2})$

Step 2.1.14

Multiply $3$ by $- 7$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} + 3 x^{2} (- 9 x^{2})$

Step 2.1.15

Rewrite using the commutative property of multiplication.

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} + 3 \cdot - 9 x^{2} x^{2}$

Step 2.1.16

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

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Step 2.1.16.1

Move $x^{2}$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} + 3 \cdot - 9 (x^{2} x^{2})$

Step 2.1.16.2

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

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} + 3 \cdot - 9 x^{2 + 2}$

Step 2.1.16.3

Add $2$ and $2$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} + 3 \cdot - 9 x^{4}$

Step 2.1.17

Multiply $3$ by $- 9$ .

$2 - 7 x - 9 x^{2} + 8 x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} - 27 x^{4}$

Step 2.2

Simplify by adding terms.

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Step 2.2.1

Add $- 7 x$ and $8 x$ .

$2 - 9 x^{2} + x - 28 x^{2} - 36 x^{3} + 6 x^{2} - 21 x^{3} - 27 x^{4}$

Step 2.2.2

Subtract $28 x^{2}$ from $- 9 x^{2}$ .

$2 - 37 x^{2} + x - 36 x^{3} + 6 x^{2} - 21 x^{3} - 27 x^{4}$

Step 2.2.3

Add $- 37 x^{2}$ and $6 x^{2}$ .

$2 - 31 x^{2} + x - 36 x^{3} - 21 x^{3} - 27 x^{4}$

Step 2.2.4

Subtract $21 x^{3}$ from $- 36 x^{3}$ .

$2 - 31 x^{2} + x - 57 x^{3} - 27 x^{4}$

Step 2.2.5

Simplify the expression.

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Step 2.2.5.1

Move $2$ .

$- 31 x^{2} + x - 57 x^{3} - 27 x^{4} + 2$

Step 2.2.5.2

Move $x$ .

$- 31 x^{2} - 57 x^{3} - 27 x^{4} + x + 2$

Step 2.2.5.3

Move $- 31 x^{2}$ .

$- 57 x^{3} - 27 x^{4} - 31 x^{2} + x + 2$

Step 2.2.5.4

Reorder $- 57 x^{3}$ and $- 27 x^{4}$ .

$- 27 x^{4} - 57 x^{3} - 31 x^{2} + x + 2$