Q. Given the function y=(−5x−9)4, find dxdy in any form.Answer: dxdy=
Identify Functions: To find the derivative of the function y=(−5x−9)4 with respect to x, we will use the chain rule. 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: First, let's identify the outer function and the inner function. The outer function is u4 and the inner function is u=−5x−9. We will take the derivative of the outer function with respect to the inner function, which is 4u3.
Derivative of Inner Function: Now we will take the derivative of the inner function, u=−5x−9, with respect to x. The derivative of −5x is −5 and the derivative of a constant (−9) is 0. So, the derivative of the inner function is −5.
Apply Chain Rule: Next, we will apply the chain rule by multiplying the derivative of the outer function by the derivative of the inner function. This gives us (4u3)(−5), where u=−5x−9.
Substitute Back: Substitute u back into the expression to get the derivative in terms of x. This gives us (4(−5x−9)3)(−5).
Simplify Expression: Finally, we simplify the expression to get the derivative of y with respect to x. This results in −20(−5x−9)3.
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