Q. Given the function f(x)=(−x2−8x−8)5, find f′(x) in any form.Answer: f′(x)=
Identify Functions: Identify the outer function and the inner function for the application of the chain rule.The outer function is u5 and the inner function is u=−x2−8x−8.
Apply Chain Rule: Apply the chain rule which states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.Let u=−x2−8x−8, then f(x)=u5.The chain rule gives us f′(x)=5u4⋅(dxdu).
Calculate Derivative: Calculate the derivative of the inner function u with respect to x.dxdu=dxd(−x2−8x−8)=−2x−8.
Substitute into Formula: Substitute the derivative of the inner function and the inner function itself into the chain rule formula. f′(x)=5(−x2−8x−8)4⋅(−2x−8).
Simplify Expression: Simplify the expression if necessary.In this case, the expression is already in a simplified form, so we can state the final answer.f′(x)=5(−x2−8x−8)4∗(−2x−8).
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