решите уравнение: (9x-3,6) x (-0.5) = -7x +2.1

Question

решите уравнение:

(9x-3,6) x (-0.5) = -7x +2.1

Answer 1

(9x^2-3,6x)*(-0.5)=-7x+2.1

-4.5x^2-1.8x+7x-2.1=0

-4.5x^2+6.2x-2.1=0

D=38.44-37.8=0.64

x=-6.2-0.8/2 =2.7

x=6.2+0.8/2=3.5