Question

I have to multiply and simplify very confused z^2-49/x^2(z^2-7z/zz^2+z-56)

Answer 1

z^2 - 49 z^2 - 7z
-------- * -----------
z^2 z^2 + z - 56

Is this the problem?

Answer 2

(z-7)^2(z+7)z/(z(z-7)(z+8)
(z-7)^2z/(z+8)

Answer 3

(z + 7)(z - 7) z(z - 7)
----------- * ----------
z * z (z + 8)(z - 7)

a (z - 7) on top cancels with a (z - 7) on the bottom
a "z" on the top cancels with a "z" on the bottom

Leaving.

(z + 7)(z - 7)
------------
z(z + 8)