Question

Dado
$f(x) = {x}^{3} - 5 {x}^{2} - 4x + 20$
demostrar que:
$f(0) = - 2 \: f(3)$

Answer 1

Calculas f(0) y f(3):
f(0) = 0³ -5(0)² - 4(0) + 20 = 20
f(3) = 3³ -5(3)² - 4(3) + 20 = 27 - 45 - 12 + 20 = -10
-2f(3) = -2(-10) = 20 = f(0)

Saludos!