Apply the distributive property.

Apply the distributive property.

Apply the distributive property.

Combine the opposite terms in .

Reorder the factors in the terms and .

Add and .

Add and .

Simplify each term.

Multiply by by adding the exponents.

Use the power rule to combine exponents.

Add and .

Multiply by .

Simplify (b^2+8)(b^2-8)