(3x+2)(2x-1)- 3x (2x + 3) +2х, при х = -0,4

Решение: $$(3x+2)(2x-1) - 3x(2x+3) + 2x = 3x(2x-1) + 2(2x-1) - 6x^2 - 9x + 2x = 6x^2 - 3x + 4x - 2 - 6x^2 - 9x + 2x = (6-6)x^2 + (-3+4-9+2)x - 2 = -6x - 2 При x = -0.4: $$-6*(-0.4) - 2 = 2.4 - 2 = 0.4$$ Ответ: 0.4