Question 442932
Can you put parenthesis around the numerators of your fractions? It's hard to tell where one fraction ends and one begins.
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I'll give it a try. Please correct me if I'm not using the correct fraction.

{{{(z^2+11z)/(z^2-2z) + (z^2-8z)/(z^2-2z)}}}

We have the same denominator, so we can add numerators.

{{{(z^2+11z + z^2 -8z)/(z^2-2z)}}}
{{{(2z^2 +3z)/(z^2-2z) = (z(2z+3))/(z(z-2)) = (cross(z)(2z+3))/(cross(z)(z-2)) = (2z+3)/(z-2)}}}

Yes, you are correct. Good job :)