Q. Find the derivative of the following function.y=log6(−2x4−7x3)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=log6(−2x4−7x3). This is a logarithmic differentiation problem.
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. For the logarithmic function y=log6(u), where u=−2x4−7x3, the derivative with respect to x is y′=(1/(u⋅ln(6)))⋅dxdu.
Differentiate Inner Function: Differentiate the inner function u=−2x4−7x3 with respect to x. The derivative of u with respect to x is dxdu=dxd(−2x4)+dxd(−7x3)=−8x3−21x2.
Substitute Derivative into Formula: Substitute the derivative of the inner function into the chain rule formula.Now we have y′=((−2x4−7x3)⋅ln(6))1⋅(−8x3−21x2).
Simplify Derivative: Simplify the expression for the derivative.We can leave the derivative in its current form, as it is fully simplified and each term is in terms of x.
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