Find $\frac { d } { d x } \left( \sqrt { 1 + 8 ^ { 9 x } } \right)$

question 139

Multiple Choice

Find $\frac { d } { d x } \left( \sqrt { 1 + 8 ^ { 9 x } } \right)$ .

• A) \(\sqrt { 9 \cdot \ln 8 \cdot 8 ^ { 9 x } }\)
• B) \(\sqrt { 9 x \cdot 8 ^ { 9 x - 1 } }\)
• C) \(\frac { 9 \cdot \ln 8 \cdot 8 ^ { 9 x } } { 2 \sqrt { 1 + 8 ^ { 9 x } } }\)
• D) \(\frac { 9 x \cdot 8 ^ { 9 x - 1 } } { 2 \sqrt { 1 + 8 ^ { 9 x } } }\)

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