Question

Seja a função afim f (x) = 4x - 12. O valor de x para que F(x) > 0?
A) X < - 9
B) X > 3
C) X < 3
D) X < 9
E) X > 9

Answer 1

$f (x) = 4x - 12 \\ \\ 4x - 12\ \textgreater \ 0\\4x\ \textgreater \ 12\\x\ \textgreater \ \frac{12}{4}\\\boxed{x\ \textgreater \ 3}$