(-x-1)(x-4)=x(4x-11)

Question

(-x-1)(x-4)=x(4x-11)

Answer 1

-x²+4x-x+4=4x²-11x
-5x²+14x+4=0
D=14²-4×(-5)×4=196+80=276
√D=√276
x1,2=-14±√276/-2