Q. Given the function f(x)=−2(−8x−5)5, find f′(x) in any form.Answer: f′(x)=
Identify Functions: We are given the function f(x)=−2(−8x−5)5 and we need to find its derivative, which is denoted by f′(x). To find the derivative, we will use 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.
Find Outer Function Derivative: First, let's identify the outer function and the inner function. The outer function is u5 where u is the inner function, and the inner function is −8x−5.
Find Inner Function Derivative: Now, we will find the derivative of the outer function with respect to u, which is 5u5−1=5u4.
Apply Chain Rule: Next, we will find the derivative of the inner function with respect to x, which is the derivative of −8x−5. The derivative of −8x is −8, and the derivative of a constant (−5) is 0. So, the derivative of the inner function is −8.
Calculate Final Derivative: Now, we apply the chain rule. The derivative of f(x) with respect to x is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.This gives us f′(x)=5(−8x−5)4×(−8).
Calculate Final Derivative: Now, we apply the chain rule. The derivative of f(x) with respect to x is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.This gives us f′(x)=5(−8x−5)4×(−8).Finally, we simplify the expression by multiplying the constants 5 and −8, which gives us f′(x)=−40(−8x−5)4.
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