Question

qual o resultado de: (x2 +2x+4)×(x-2)-(x2-2x+4)×(x+2)​

Answer 1

(x² + 2x + 4).(x - 2) - (x² - 2x + 4).(x + 2)

x².x - x² .2 + 2x.x - 2.2x + 4.x - 4.2 - (x².x + x².2 - 2x.x - 2x.2 + 4.x + 4.2)

x³ - 2x² + 2x² - 4x + 4x - 8 - (x³ + 2x² - 2x² - 4x + 4x + 8)

x³ - x³ - 2x² + 2x² - 2x² + 2x² - 4x + 4x - 4x + 4x - 8 - 8

-16