(х-6)^2=х-6
x²-12x+36=x-6
x²-13x+42=0
D= 169-4*42=1
x1= (13+1)/2=7
x2=(13-1)/2=6
Объяснение:
х1 = 7; х2 = 6.
(x-6)²=x-6;
x²-12x+36-x-6=0;
x²-13x+30=0;
D=b²-4ac=169-4*1*(-30)=169+120=289>0;
x1= 7;
x2= 6;
