(x-5)²+5(2x-1)=0 алгебра

Question

(x-5)²+5(2x-1)=0 алгебра

Answer 1

X^2+10x+25+10x-5=0;
x^2+20x+20=0;
D=400-4*1*20=400-80=360;
x1=(-20+60)/2=20;
x2=(-20-60)/2=-40