Q. Find the derivative of the following function.y=log5(x3−2x2)Answer: y′=
Understand function and base: Understand the function and the base of the logarithm.We are given the function y=log5(x3−2x2), which is a logarithm with base 5. To find the derivative, we will need to use the change of base formula and the chain rule.
Apply change of base: Apply the change of base formula to the logarithmic function.The change of base formula allows us to write the logarithm with base 5 in terms of the natural logarithm (ln):y=log5(x3−2x2)=ln(5)ln(x3−2x2)
Differentiate using chain rule: Differentiate the function using the chain rule.To find y′, we need to differentiate ln(x3−2x2) with respect to x and then divide by ln(5), which is a constant.Using the chain rule, the derivative of ln(u) with respect to x is (1/u)⋅dxdu, where u=x3−2x2.
Calculate inner function derivative: Calculate the derivative of the inner function u=x3−2x2.The derivative of u with respect to x is dxdu=3x2−4x.
Combine to find derivative: Combine the results to find the derivative of y. Now we can write the derivative of y as: y′=(x3−2x2)1⋅ln(5)(3x2−4x)
Simplify derivative expression: Simplify the derivative expression.We can leave the derivative in its current form, or we can simplify it further by distributing the numerator:y′=(x3−2x2)⋅ln(5)3x2−4x
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