Apply the distributive property.

Reorder.

Rewrite using the commutative property of multiplication.

Rewrite using the commutative property of multiplication.

Multiply by by adding the exponents.

Use the power rule to combine exponents.

Add and .

Multiply by .

Multiply by by adding the exponents.

Multiply by .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Multiply by .

Simplify 8y^2(4y^7+9y)