hello again I need confirmation on some questions please!

"Simplify each of the following fractions. If they are already simplified say so.

1) a^2-2ab+b^2/a-b[my answer was: already simplified]

2) a^2-2ab+b^2/a+b[my answer was: already simplified]

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"Some students simplify 2x^2-32/x-4 as 2x-8.

Choose values of x to show that this is not true.Then simplify it correctly."

I answered: Any value of x proves them incorrect. my simplification was:2x+8

thanks for all your help!