Q. Find the derivative of the following function.y=69x6+8x5Answer: y′=
Identify Function Type and Rule: Identify the type of function and the rule needed to find its derivative.The function y=69x6+8x5 is an exponential function with a variable exponent. To differentiate it, we need to use the chain rule and the fact that the derivative of au with respect to x is au⋅ln(a)⋅u′, where u is a function of x.
Apply Chain Rule: Apply the chain rule to differentiate the function.Let u=9x6+8x5. Then y=6u. The derivative of y with respect to x is dxdy=dxd(6u)=6u⋅ln(6)⋅dxdu.
Find u Derivative: Find the derivative of u with respect to x. We have u=9x6+8x5. The derivative of u with respect to x is dxdu=dxd(9x6)+dxd(8x5)=54x5+40x4.
Substitute into dxdy: Substitute the derivative of u into the derivative of y. Now we can substitute dxdu into the expression for dxdy from Step 2. We get dxdy=6(9x6+8x5)⋅ln(6)⋅(54x5+40x4).
Simplify if Necessary: Simplify the expression if necessary.The expression for the derivative is already in its simplest form, so no further simplification is needed.
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