Simplify (2a-3b)(2a^2+6b^2)+(6a^2b+12ab^2-7b^3)

$(2 a - 3 b) (2 a^{2} + 6 b^{2}) + (6 a^{2} b + 12 a b^{2} - 7 b^{3})$

Step 1

Remove parentheses.

$(2 a - 3 b) (2 a^{2} + 6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Step 2

Simplify each term.

Expand $(2 a - 3 b) (2 a^{2} + 6 b^{2})$ using the FOIL Method.

Apply the distributive property.

$2 a (2 a^{2} + 6 b^{2}) - 3 b (2 a^{2} + 6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Apply the distributive property.

$2 a (2 a^{2}) + 2 a (6 b^{2}) - 3 b (2 a^{2} + 6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Apply the distributive property.

$2 a (2 a^{2}) + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Simplify each term.

Rewrite using the commutative property of multiplication.

$2 \cdot 2 a \cdot a^{2} + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

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

Move $a^{2}$ .

$2 \cdot 2 (a^{2} a) + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

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

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

$2 \cdot 2 (a^{2} a^{1}) + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

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

$2 \cdot 2 a^{2 + 1} + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Add $2$ and $1$ .

$2 \cdot 2 a^{3} + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Multiply $2$ by $2$ .

$4 a^{3} + 2 a (6 b^{2}) - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Rewrite using the commutative property of multiplication.

$4 a^{3} + 2 \cdot 6 a b^{2} - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Multiply $2$ by $6$ .

$4 a^{3} + 12 a b^{2} - 3 b (2 a^{2}) - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Rewrite using the commutative property of multiplication.

$4 a^{3} + 12 a b^{2} - 3 \cdot 2 b a^{2} - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Multiply $- 3$ by $2$ .

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 3 b (6 b^{2}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Rewrite using the commutative property of multiplication.

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 3 \cdot 6 b \cdot b^{2} + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

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

Move $b^{2}$ .

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 3 \cdot 6 (b^{2} b) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

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

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

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 3 \cdot 6 (b^{2} b^{1}) + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

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

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 3 \cdot 6 b^{2 + 1} + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Add $2$ and $1$ .

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 3 \cdot 6 b^{3} + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Multiply $- 3$ by $6$ .

$4 a^{3} + 12 a b^{2} - 6 b a^{2} - 18 b^{3} + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Step 3

Simplify by adding terms.

Combine the opposite terms in $4 a^{3} + 12 a b^{2} - 6 b a^{2} - 18 b^{3} + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$ .

Reorder the factors in the terms $- 6 b a^{2}$ and $6 a^{2} b$ .

$4 a^{3} + 12 a b^{2} - 6 a^{2} b - 18 b^{3} + 6 a^{2} b + 12 a b^{2} - 7 b^{3}$

Add $- 6 a^{2} b$ and $6 a^{2} b$ .

$4 a^{3} + 12 a b^{2} - 18 b^{3} + 0 + 12 a b^{2} - 7 b^{3}$

Add $4 a^{3} + 12 a b^{2} - 18 b^{3}$ and $0$ .

$4 a^{3} + 12 a b^{2} - 18 b^{3} + 12 a b^{2} - 7 b^{3}$

Add $12 a b^{2}$ and $12 a b^{2}$ .

$4 a^{3} - 18 b^{3} + 24 a b^{2} - 7 b^{3}$

Subtract $7 b^{3}$ from $- 18 b^{3}$ .

$4 a^{3} - 25 b^{3} + 24 a b^{2}$

Simplify (2a-3b)(2a^2+6b^2)+(6a^2b+12ab^2-7b^3)

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