Where Is the Function F(x) = + 12x $\infty$ , -2) and Increasing on (-2

Multiple Choice

Where is the function f(x) = + 12x + 7 increasing, and where is it decreasing?

A) decreasing on (- $\infty$ , -2) and increasing on (-2, $\infty$ )
B) increasing on (- $\infty$ , -2) and decreasing on (-2, $\infty$ )
C) decreasing on (- $\infty$ , -4) and increasing on (-4, $\infty$ )
D) increasing on (- $\infty$ , $\infty$ )
E) increasing on (- $\infty$ , -4) and decreasing on (-4, $\infty$ )