Q. Given the function y=(−x2−5x)3, find dxdy in any form.Answer: dxdy=
Identify Functions: We are given the function y=(−x2−5x)3 and we need to find its derivative with respect to 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.
Find Outer Function Derivative: First, let's identify the outer function and the inner function. The outer function is u3 and the inner function is u=−x2−5x. We will find the derivative of the outer function with respect to u, which is 3u2.
Find Inner Function Derivative: Now, we will find the derivative of the inner function with respect to x, which is the derivative of u=−x2−5x. Using the power rule, the derivative of −x2 is −2x, and the derivative of −5x is −5. So, the derivative of the inner function is dxdu=−2x−5.
Apply Chain Rule: Next, we apply the chain rule by multiplying the derivative of the outer function with respect to u by the derivative of the inner function with respect to x. This gives us dxdy=3u2⋅(−2x−5).
Substitute Back for Final Result: Substitute the inner function u back into the expression for dxdy to get the derivative in terms of x. So, dxdy=3(−x2−5x)2⋅(−2x−5).
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