Q. Find the derivative of the following function.y=47x4Answer: y′=
Recognize Composition of Functions: First, we need to recognize that this is a composition of functions and we will need to use the chain rule to find the derivative. 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.
Derivative of Outer Function: The outer function is 4u where u=7x4. The derivative of 4u with respect to u is extln(4)∗4u because the derivative of au is extln(a)∗au.
Derivative of Inner Function: The inner function is u=7x4. The derivative of u with respect to x is 28x3 because the derivative of xn is n⋅x(n−1).
Apply Chain Rule: Now we apply the chain rule by multiplying the derivative of the outer function by the derivative of the inner function. This gives us:y′=ln(4)⋅47x4⋅28x3
Simplify Final Answer: Simplify the expression to get the final answer:y′=28ln(4)⋅47x4⋅x3
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