Question

Determinar as raízes de f(x)= x^3 – 9x

Answer 1

Função: $f(x)= x^3-9x$

Encontrando as raízes:
$x^3-9x= 0 \\ \\ x \cdot ( x^2-9) = 0 \\ \\ x \cdot [(x+3) \cdot (x-3)] = 0 \\ \\ \boxed{x= 0 ~~~~ x= -3 ~~~~ x=3}$