If you notice:
So, now you have:
Just solve that and you should have your answer.
I'm stumped on this.
x^2 + (x+5)^2 =(5√5)^2
Now, I tried canceling out the radical. That gives me "0" for C when factoring, though, so it doesn't work out ( I believe).
Doing 5^2 * 5 gives me 625, which gives me x=-20, 15 after factoring. Doesn't check out.