(7х-1)*(2+х)=(х-4)*(х-4)

Question

(7х-1)*(2+х)=(х-4)*(х-4)

Answer 1

14x+7x²-2-x=x²-4x-4x+16
7x²-x²+14x-x+4x+4x-2-16=0
6x²+21x-18=0
2x²+7x-6=0
D=49+48=97
x1=(-7+√97)/4
x2=(-7-√97)/4