Question

Раскрой скобки: (x+12)⋅(x−8)

Answer 1

x^2 - 8x + 12x - 96

Answer 2

Я продолжение не увидела

Answer 3

х^2 - 8x + 12x - 96 = x^2 + 4x - 96.
D = 16 + 384 = 400 = 20^2
x1 =  (-4 - 20)/2 = -12
x2 = (-4 + 20)/2 = 8