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Differentiate a composite function by the chain rule
DIFFICULTY
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Question 1 of 8
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The rule for a function is shown below
\[f(u)=\left(3\,u + 7\right)^{2}\]
1 mark
Find the derivative of the displayed function
\[f'(u)=3\]
\[f'(u)=2\,\left(3\,u + 7\right)^{1}\]
\[f'(u)=2\,\left(3\,u + 7\right)^{1}\,\left(3\right)\]
\[f'(u)=2\,u^{1}\,\left(3\right)\]
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