Question

4 спростить в раз молю

Answer 1

-14

(x-2)(x+5) - (x+3)(x-4)= x² + 5x - 2x -10 -(x² - 4x + 3x -12) = x² + 5x - 2x - 10 - x² + 4x - 3x + 12= x²-x² + 5x - 2x - 3x + 4x - 10 +12 = 4x + 2

при x = -4

4 × (-4) + 2 = -16 + 2 = -14