Pre-Algebra Examples

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

Step 1

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

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

Step 2

Simplify terms.

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Step 2.1

Simplify each term.

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Step 2.1.1

Rewrite using the commutative property of multiplication.

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

Step 2.1.2

Multiply $x^{2}$ by $x^{3}$ by adding the exponents.

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Step 2.1.2.1

Move $x^{3}$ .

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

Step 2.1.2.2

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

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

Step 2.1.2.3

Add $3$ and $2$ .

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

Step 2.1.3

Rewrite using the commutative property of multiplication.

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

Step 2.1.4

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

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Step 2.1.4.1

Move $x$ .

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

Step 2.1.4.2

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

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Step 2.1.4.2.1

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

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

Step 2.1.4.2.2

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

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

Step 2.1.4.3

Add $1$ and $2$ .

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

Step 2.1.5

Rewrite using the commutative property of multiplication.

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

Step 2.1.6

Multiply $x$ by $x^{3}$ by adding the exponents.

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Step 2.1.6.1

Move $x^{3}$ .

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

Step 2.1.6.2

Multiply $x^{3}$ by $x$ .

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Step 2.1.6.2.1

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

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

Step 2.1.6.2.2

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

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

Step 2.1.6.3

Add $3$ and $1$ .

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

Step 2.1.7

Multiply $4$ by $2$ .

$2 x^{5} - 3 x^{3} + 8 x^{4} + 4 x (- 3 x) - 5 (2 x^{3}) - 5 (- 3 x)$

Step 2.1.8

Rewrite using the commutative property of multiplication.

$2 x^{5} - 3 x^{3} + 8 x^{4} + 4 \cdot - 3 x \cdot x - 5 (2 x^{3}) - 5 (- 3 x)$

Step 2.1.9

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

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Step 2.1.9.1

Move $x$ .

$2 x^{5} - 3 x^{3} + 8 x^{4} + 4 \cdot - 3 (x \cdot x) - 5 (2 x^{3}) - 5 (- 3 x)$

Step 2.1.9.2

Multiply $x$ by $x$ .

$2 x^{5} - 3 x^{3} + 8 x^{4} + 4 \cdot - 3 x^{2} - 5 (2 x^{3}) - 5 (- 3 x)$

Step 2.1.10

Multiply $4$ by $- 3$ .

$2 x^{5} - 3 x^{3} + 8 x^{4} - 12 x^{2} - 5 (2 x^{3}) - 5 (- 3 x)$

Step 2.1.11

Multiply $2$ by $- 5$ .

$2 x^{5} - 3 x^{3} + 8 x^{4} - 12 x^{2} - 10 x^{3} - 5 (- 3 x)$

Step 2.1.12

Multiply $- 3$ by $- 5$ .

$2 x^{5} - 3 x^{3} + 8 x^{4} - 12 x^{2} - 10 x^{3} + 15 x$

Step 2.2

Simplify by adding terms.

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Step 2.2.1

Subtract $10 x^{3}$ from $- 3 x^{3}$ .

$2 x^{5} - 13 x^{3} + 8 x^{4} - 12 x^{2} + 15 x$

Step 2.2.2

Move $- 13 x^{3}$ .

$2 x^{5} + 8 x^{4} - 13 x^{3} - 12 x^{2} + 15 x$