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Find the derivative of the following function.

y=log_(8)(-9x^(5))
Answer: 
y^(')=

Find the derivative of the following function.\newliney=log8(9x5) y=\log _{8}\left(-9 x^{5}\right) \newlineAnswer: y= y^{\prime}=

Full solution

Q. Find the derivative of the following function.\newliney=log8(9x5) y=\log _{8}\left(-9 x^{5}\right) \newlineAnswer: y= y^{\prime}=
  1. Understand and apply chain rule: Understand the function and apply the chain rule.\newlineThe function y=log8(9x5)y=\log_{8}(-9x^{5}) is a logarithmic function with base 88. To find the derivative, we need to 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.
  2. Convert base to natural logarithm: Convert the base of the logarithm to the natural logarithm (ln\ln).\newlineThe derivative of a logarithm with base 88 can be found by converting it to a natural logarithm using the change of base formula: loga(b)=ln(b)ln(a)\log_{a}(b) = \frac{\ln(b)}{\ln(a)}. So, y=log8(9x5)y=\log_{8}(-9x^{5}) becomes y=ln(9x5)ln(8)y=\frac{\ln(-9x^{5})}{\ln(8)}.
  3. Differentiate outer function: Differentiate the outer function.\newlineThe outer function is ln(9x5)\ln(-9x^{5}). The derivative of ln(u)\ln(u), where uu is a function of xx, is 1uu\frac{1}{u} \cdot u', where uu' is the derivative of uu. So, the derivative of ln(9x5)\ln(-9x^{5}) with respect to xx is 19x5\frac{1}{-9x^{5}} times the derivative of ln(u)\ln(u)00 with respect to xx.
  4. Differentiate inner function: Differentiate the inner function.\newlineThe inner function is 9x5-9x^{5}. The derivative of 9x5-9x^{5} with respect to xx is 45x4-45x^{4} (using the power rule: ddx[xn]=nxn1\frac{d}{dx} [x^n] = nx^{n-1}).
  5. Apply chain rule: Apply the chain rule.\newlineNow, we multiply the derivative of the outer function by the derivative of the inner function. This gives us (1(9x5))×(45x4)(\frac{1}{(-9x^{5})}) \times (-45x^{4}).
  6. Simplify expression: Simplify the expression.\newlineSimplifying the expression 1(9x5)(45x4)\frac{1}{(-9x^{5})} \cdot (-45x^{4}) gives us 45x49x5-\frac{45x^{4}}{-9x^{5}} which simplifies to 5x\frac{5}{x}.
  7. Include base conversion derivative: Include the derivative of the base conversion.\newlineWe must not forget to include the denominator ln(8)\ln(8) from the base conversion in Step 22. The final derivative of the function yy with respect to xx is 5x/ln(8)\frac{5}{x}/\ln(8).
  8. Write final answer: Write the final answer.\newlineThe final answer for the derivative of the function y=log8(9x5)y=\log_{8}(-9x^{5}) is y=5x1ln(8)y' = \frac{5}{x}\cdot\frac{1}{\ln(8)}.

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