Question

решите уравнения:

(3x-1)^2-8(x+1)^2-(x+2)(x-2)

Answer 1

(3х-1)^2-8(x+1)^2-(x+2)(x-2)
9x^2-6x+1-8(x^2+2x+1)-(x^2-4)
9x^2-6x+1-8x^2-16x-8-x^2+4
-22x-3
-22x=3
x=-3/22