Question

13square=(x-7)square+xsquare

Answer 1

13^2=(x-7)^2 + x^2
169=x^2+49 -14x +x^2
2x^2 -14x - 120 =0
2(x^2 - 7x - 60)=0
x^2 +5x -12x - 60=0
x(x+5) -12(x+5)=0
x-12=0,x+5=0
x=12,-5
hope this helps u

Answer 2

therefore the answer is 12 or -5