To divide by a fraction, multiply by its reciprocal.
Simplify the numerator.
Rewrite 64 as 82.
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=z and b=8.
Cancel the common factor of z+8.
Cancel the common factor.
Rewrite the expression.
Multiply z-8z and z+9.