Question

Considere a função f:R*->R tal que f(x)=x²-12/x, calculando f(3), encontramos:

a)3 b)-3 c)1 d)-1 e)6

Answer 1

Letra D)

$f(x)=\frac{x^2-12}{x} \\ \\ f(3)=\frac{3^2-12}{3} \\ \\ f(3)= \frac{9-12}{3}= \frac{-3}{3} =~\boxed{\boxed{-1 }}$