Q. Find the derivative of the following function.y=e−6x6−9x5Answer: y′=
Identify function: Identify the function to differentiate.We are given the function y=e(−6x6−9x5). We need to find its derivative with respect to x.
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 eu, where u=−6x6−9x5, and the inner function is u(x)=−6x6−9x5.
Differentiate outer function: Differentiate the outer function with respect to the inner function. The derivative of eu with respect to u is eu. So, the derivative of e(−6x6−9x5) with respect to the inner function u is e(−6x6−9x5).
Differentiate inner function: Differentiate the inner function with respect to x. The inner function u(x)=−6x6−9x5 is a polynomial, and we differentiate it term by term. The derivative of −6x6 with respect to x is −36x5, and the derivative of −9x5 with respect to x is −45x4.
Combine using chain rule: Combine the results using the chain rule.Multiplying the derivative of the outer function by the derivative of the inner function, we get:y′=e(−6x6−9x5)⋅(−36x5−45x4)
Simplify expression: Simplify the expression if possible.In this case, there is no further simplification needed, so the final answer is:y′=e(−6x6−9x5)⋅(−36x5−45x4)
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