Pre-Algebra Examples

$(7 a^{2} - 2 b^{2}) (8 a^{3} + 5 b^{3})$

Step 1

Expand $(7 a^{2} - 2 b^{2}) (8 a^{3} + 5 b^{3})$ using the FOIL Method.

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Step 1.1

Apply the distributive property.

$7 a^{2} (8 a^{3} + 5 b^{3}) - 2 b^{2} (8 a^{3} + 5 b^{3})$

Step 1.2

Apply the distributive property.

$7 a^{2} (8 a^{3}) + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3} + 5 b^{3})$

Step 1.3

Apply the distributive property.

$7 a^{2} (8 a^{3}) + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

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.

$7 \cdot 8 a^{2} a^{3} + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.2

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

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Step 2.1.2.1

Move $a^{3}$ .

$7 \cdot 8 (a^{3} a^{2}) + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.2.2

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

$7 \cdot 8 a^{3 + 2} + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.2.3

Add $3$ and $2$ .

$7 \cdot 8 a^{5} + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.3

Multiply $7$ by $8$ .

$56 a^{5} + 7 a^{2} (5 b^{3}) - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.4

Rewrite using the commutative property of multiplication.

$56 a^{5} + 7 \cdot 5 a^{2} b^{3} - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.5

Multiply $7$ by $5$ .

$56 a^{5} + 35 a^{2} b^{3} - 2 b^{2} (8 a^{3}) - 2 b^{2} (5 b^{3})$

Step 2.1.6

Rewrite using the commutative property of multiplication.

$56 a^{5} + 35 a^{2} b^{3} - 2 \cdot 8 b^{2} a^{3} - 2 b^{2} (5 b^{3})$

Step 2.1.7

Multiply $- 2$ by $8$ .

$56 a^{5} + 35 a^{2} b^{3} - 16 b^{2} a^{3} - 2 b^{2} (5 b^{3})$

Step 2.1.8

Rewrite using the commutative property of multiplication.

$56 a^{5} + 35 a^{2} b^{3} - 16 b^{2} a^{3} - 2 \cdot 5 b^{2} b^{3}$

Step 2.1.9

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

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Step 2.1.9.1

Move $b^{3}$ .

$56 a^{5} + 35 a^{2} b^{3} - 16 b^{2} a^{3} - 2 \cdot 5 (b^{3} b^{2})$

Step 2.1.9.2

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

$56 a^{5} + 35 a^{2} b^{3} - 16 b^{2} a^{3} - 2 \cdot 5 b^{3 + 2}$

Step 2.1.9.3

Add $3$ and $2$ .

$56 a^{5} + 35 a^{2} b^{3} - 16 b^{2} a^{3} - 2 \cdot 5 b^{5}$

Step 2.1.10

Multiply $- 2$ by $5$ .

$56 a^{5} + 35 a^{2} b^{3} - 16 b^{2} a^{3} - 10 b^{5}$

Step 2.2

Reorder.

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Step 2.2.1

Move $b^{2}$ .

$56 a^{5} + 35 a^{2} b^{3} - 16 a^{3} b^{2} - 10 b^{5}$

Step 2.2.2

Move $35 a^{2} b^{3}$ .

$56 a^{5} - 16 a^{3} b^{2} + 35 a^{2} b^{3} - 10 b^{5}$