Identify the Open Intervals Where the Function $f ( x ) = 4 x ^ { 2 } - 5 x - 5$

question 38

Multiple Choice

Identify the open intervals where the function $f ( x ) = 4 x ^ { 2 } - 5 x - 5$ is increasing or decreasing.

• A)decreasing: \(\left( - \infty , \frac { 5 } { 8 } \right)\) ; increasing: \(\left( \frac { 5 } { 8 } , \infty \right)\)
• B)increasing: \(\left( - \infty , \frac { 5 } { 8 } \right)\) ; decreasing: \(\left( \frac { 5 } { 8 } , \infty \right)\)
• C)increasing on \(( - \infty , \infty )\)
• D)decreasing on \(( - \infty , \infty )\)
• E)none of the above

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