Question

(х-4) в квадрате - (х+1)*(х+2)=?

Answer 1

(x - 4)² - (x - 1) * (x +2) = (x - 4)² - (x² + x -2) = x² - 8x +16 - x² - x + 2 = -9x +18 = 9(-x + 2)