Question

Easy Medal

Answer 1

You need to start by factoring the trinomial
(x+5)(x+5) = z^2
(x+5)^2 = z^2
|x+5| = |z|
x = z-5

Answer 2

Oh didn't see that's -10x. Hang on a sec

Answer 3

it's the same idea
(x-5)(x-5) instead of (x+5)(x+5)
so x = z + 5

Answer 4

yeah sorry about that, my internet connection died after I replied. jigglypuff314 is right!