Q. Given the function f(x)=2(−9x2+x+6)4, 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 u4 where u is the inner function, and the inner function is −9x2+x+6. The chain rule 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.
Differentiate Outer Function: Differentiate the outer function with respect to the inner function u. The derivative of u4 with respect to u is 4u3.
Differentiate Inner Function: Differentiate the inner function −9x2+x+6 with respect to x. The derivative of −9x2 is −18x, the derivative of x is 1, and the derivative of 6 is 0. So, the derivative of the inner function is −18x+1.
Apply Chain Rule: Apply the chain rule to find f′(x). f′(x)=2⋅4(−9x2+x+6)3⋅(−18x+1)
Simplify Expression: Simplify the expression for f′(x).f′(x)=8(−9x2+x+6)3⋅(−18x+1)
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