Question

PLEASE HELP QUICKLY!!!

x^2 + (x+9)^2 = 45^2

Answer 1

Explanation:

x^2+(x+9)^2=90

x^2+(x+9)^2-90=0

x^2+x^2+9^2+2*x*9-90=0

x^2+x^2+81+18x-90=0

2x^2+18x-9=0