Q. Find the derivative of the following function.y=log3(−7x6−9x5)Answer: y′=
Identify Function & Derivative Type: Identify the function and the type of derivative to be found.We need to find the derivative of the function y with respect to x, where y=log3(−7x6−9x5). This is a logarithmic differentiation problem.
Apply Chain Rule for Logarithmic Differentiation: Apply the chain rule for logarithmic 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. For a logarithm with base 3, the derivative of y=log3(u) with respect to x is u⋅ln(3)1 times the derivative of u with respect to x, where u is the inner function.
Differentiate Inner Function: Differentiate the inner function u with respect to x. The inner function u is −7x6−9x5. Using the power rule, the derivative of u with respect to x is u′=−7⋅6x6−1−9⋅5x5−1=−42x5−45x4.
Combine Results from Steps 2 & 3: Combine the results from Step 2 and Step 3. Using the chain rule from Step 2 and the derivative of the inner function from Step 3, we get y′=((−7x6−9x5)⋅ln(3))1⋅(−42x5−45x4).
Simplify Derivative Expression: Simplify the expression for the derivative.We can factor out a common factor of x4 from the numerator to simplify the expression. y′=(−7x6−9x5)⋅ln(3)x4(−42x−45).
Check for Further Simplifications: Check for any possible simplifications. There are no further simplifications that can be made without changing the form of the expression significantly. The final answer is y′=(−7x6−9x5)ln(3)x4(−42x−45).
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