Q. Given the function f(x)=−2(−8x2−2)4, find f′(x) in any form.Answer: f′(x)=
Identify Functions: We are given the function f(x)=−2(−8x2−2)4. To find the derivative f′(x), 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.
Derivative of Outer Function: First, let's identify the outer function and the inner function. The outer function is u4 where u is the inner function, and the inner function is −8x2−2.
Derivative of Inner Function: The derivative of the outer function u4 with respect to u is 4u3. We will later substitute the inner function back into u.
Apply Chain Rule: The derivative of the inner function −8x2−2 with respect to x is −16x, since the derivative of −8x2 is −16x and the derivative of a constant is 0.
Multiply by Constant: Now, we apply the chain rule: f′(x)= derivative of outer function evaluated at inner function times derivative of inner function. This gives us f′(x)=4(−8x2−2)3×(−16x).
Simplify Expression: Finally, we multiply the constant −2 from the original function by the derivative we just found to get the complete derivative of f(x). This gives us f′(x)=−2×4(−8x2−2)3×(−16x).
Final Derivative: Simplify the expression by combining constants and keeping the rest of the expression intact. This gives us f′(x)=−2×4×(−16x)×(−8x2−2)3.
Final Derivative: Simplify the expression by combining constants and keeping the rest of the expression intact. This gives us f′(x)=−2×4×(−16x)×(−8x2−2)3.Multiplying the constants −2, 4, and −16x together, we get f′(x)=128x×(−8x2−2)3.
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