Q. Find the derivative of the following function.y=ln(x2+8x)Answer: y′=
Identify function: Identify the function to differentiate.The function given is y=ln(x2+8x). We need to find the derivative of this function 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 ln(u) and the inner function is u(x)=x2+8x.
Differentiate outer function: Differentiate the outer function with respect to the inner function.The derivative of ln(u) with respect to u is u1. So, if y=ln(u), then dudy=u1.
Differentiate inner function: Differentiate the inner function with respect to x. The inner function is u(x)=x2+8x. Using the power rule, the derivative of x2 is 2x, and the derivative of 8x is 8. Therefore, dxdu=2x+8.
Apply chain rule for derivative: Apply the chain rule to find the derivative of y with respect to x. Using the chain rule, dxdy=dudy⋅dxdu. We have already found dudy=u1 and dxdu=2x+8. Now we need to substitute u back in terms of x to get the final derivative.
Substitute and simplify: Substitute u with x2+8x and simplify the expression.Substituting u with x2+8x in the expression dudy=u1, we get dudy=x2+8x1. Now, multiply this by dxdu=2x+8 to get the final derivative.dxdy=(x2+8x1)⋅(2x+8).
Final derivative: Simplify the expression for the derivative.dxdy=x2+8x2x+8.This is the final derivative of the function y=ln(x2+8x).
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