Find the intervals on which the function is increasing and the intervals on which the function is decreasing.
-$$f ( x ) = 2 x ^ { 2 } + 8 x + 6$$
A) Increasing on $( - 4 , \infty )$; decreasing on $( - \infty , - 4 )$
B) Increasing on $( 8 , \infty )$; decreasing on $( - \infty , 8 )$
C) Increasing on $( 2 , \infty )$; decreasing on $( - \infty , 2 )$
D) Increasing on $( - 2 , \infty )$; decreasing on $( - \infty , - 2 )$

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The Answer of Find the intervals on which the function is increasing and the intervals on which the function is decreasing.
-$$f ( x ) = 2 x ^ { 2 } + 8 x + 6$$
A) Increasing on $( - 4 , \infty )$; decreasing on $( - \infty , - 4 )$
B) Increasing on $( 8 , \infty )$; decreasing on $( - \infty , 8 )$
C) Increasing on $( 2 , \infty )$; decreasing on $( - \infty , 2 )$
D) Increasing on $( - 2 , \infty )$; decreasing on $( - \infty , - 2 )$

Find the Intervals on Which the Function Is Increasing and the Intervals