Leg A= x^2
Leg B= x^2
Hypotenuse= 8.5 in
What is x?
AKA 8.5^2=x^2+x^2 <<<---=== If Leg A = x^2 and Leg B = x^2 then hypotenuse 8.5^2 = x^4 + x^4
which is not what you wrote.
What is x?