Identify the Open Intervals Where the Function $f ( x ) = 4 x ^ { 2 } + 6 x - 1$

Multiple Choice

Identify the open intervals where the function $f ( x ) = 4 x ^ { 2 } + 6 x - 1$ is increasing or decreasing.

A) decreasing: $\left( - \infty , - \frac { 3 } { 4 } \right)$ ; increasing: $\left( - \frac { 3 } { 4 } , \infty \right)$
B) increasing: $\left( - \infty , - \frac { 3 } { 4 } \right)$ ; decreasing: $\left( - \frac { 3 } { 4 } , \infty \right)$
C) increasing on $( - \infty , \infty )$
D) decreasing on $( - \infty , \infty )$
E) none of the above