(5x-1)²-(x-6)(x-8)=85

Question

(5x-1)²-(x-6)(x-8)=85

Answer 1

25х^2-10х+1-х^2-14х+48=85

24х^2-24х+36=0/:(-12)

2х^2-х+3=0

D= 4-24=-20(корней нет)