Factor out of .

Cancel the common factors.

Factor out of .

Factor out of .

Factor out of .

Cancel the common factor.

Rewrite the expression.

To write as a fraction with a common denominator, multiply by .

To write as a fraction with a common denominator, multiply by .

Multiply and .

Multiply and .

Reorder the factors of .

Combine the numerators over the common denominator.

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Multiply by by adding the exponents.

Use the power rule to combine exponents.

Add and .

Apply the distributive property.

Multiply by .

Multiply by .

Subtract (8z^4)/(8z+20)-2/(z^5)