Question

(x+5)^2+(x-10)^2=2x^2

Answer 1

(x+5)^2+(x-10)^2=2x^2
x^2+10x+25+x^2-20x+100-2x^2=0
-10x+125=0
10x=125
x=12,5

Answer 2

$x^{2} +10x+25+ x^{2} -20x+100-2 x^{2} =0; -10x=-125; x=12,5$