Question

(5x+6)^2 *(x-3) -(5x-1)^2 *(x-1)=28

Answer 1

25х^3-75х^2+60х^2-180х+36х-108-25х^3+25х^2+10х^2-10х-х+1=28
20х^2-155х-135=0
4х^2-31х-27=0
Д=(-31)^2-4*4*(-27)=1393 √Д=37
Х=8.5
Х=-0.75