Q. Find the derivative of the following function.y=ln(−8x5)Answer: y′=
Identify Function & Rule: Identify the function and the rule to use for differentiation.We have the function y=ln(−8x5). To find the derivative, 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.
Differentiate Outer Function: Differentiate the outer function.The outer function is the natural logarithm ln(u), where u=−8x5. The derivative of ln(u) with respect to u is u1.
Differentiate Inner Function: Differentiate the inner function.The inner function is u=−8x5. The derivative of −8x5 with respect to x is −8×5x5−1=−40x4.
Apply Chain Rule: Apply the chain rule.Using the chain rule, the derivative of y with respect to x is the derivative of the outer function times the derivative of the inner function. So, y′=(u1)×(−40x4).
Substitute Inner Function: Substitute the inner function back into the derivative.Substitute u=−8x5 back into the derivative to get y′=(−8x5)1⋅(−40x4).
Simplify Expression: Simplify the expression. Simplify the derivative to get y′=−8x5−40x4=8x540x4.
Cancel Common Factors: Cancel out common factors. Cancel x4 from the numerator and denominator, and simplify the constants to get y′=8x40=x5.
Check for Errors: Check for any mathematical errors. Review the steps to ensure there are no mathematical errors in the differentiation process.
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