Найдите корень (Х+10)^2=(х-9)^2

Question

Найдите корень
(Х+10)^2=(х-9)^2

Answer 1

Х∧2+20х+100=х∧2-18х+81
х∧2+20х+100-х∧2+18х-81=0
38х+19=0
38х=-19
х=-1/2

Answer 2

X^2+20x+100=x^2-18x+81
38x=-19
x=-0,5