Q. Find the derivative of the following function.y=49x4Answer: y′=
Identify Function & Differentiation Type: Identify the function and the type of differentiation required.We are given the function y=49x4 and we need to find its derivative with respect to x. This is an example of a composite function where we have an exponential function with a base of 4 and an exponent that is itself a function of x. To differentiate this, we will use the chain rule.
Apply Chain Rule: Apply the chain rule for differentiation.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. In this case, the outer function is 4u where u=9x4, and the inner function is u=9x4. We will first differentiate the outer function with respect to u, and then multiply it by the derivative of the inner function with respect to x.
Differentiate Outer Function: Differentiate the outer function with respect to u. The derivative of 4u with respect to u is (4u⋅ln(4)). This is because the derivative of au with respect to u is au⋅ln(a), where ln denotes the natural logarithm.
Differentiate Inner Function: Differentiate the inner function with respect to x. The derivative of 9x4 with respect to x is 36x3. This is because the derivative of xn with respect to x is n⋅x(n−1).
Combine Derivatives: Combine the derivatives using the chain rule.Now we multiply the derivative of the outer function by the derivative of the inner function to get the overall derivative of y with respect to x.y′=(49x4⋅ln(4))⋅36x3
Simplify Expression: Simplify the expression if possible.In this case, there is no further simplification that can be done without changing the form of the expression. So, the derivative of the function y=49x4 with respect to x is y′=(49x4⋅ln(4))⋅36x3.
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