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Find the derivative of the following function.

y=log_(4)(-9x^(4)-x^(3))
Answer: 
y^(')=

Find the derivative of the following function.\newliney=log4(9x4x3) y=\log _{4}\left(-9 x^{4}-x^{3}\right) \newlineAnswer: y= y^{\prime}=

Full solution

Q. Find the derivative of the following function.\newliney=log4(9x4x3) y=\log _{4}\left(-9 x^{4}-x^{3}\right) \newlineAnswer: y= y^{\prime}=
  1. Identify Function & Base: Identify the function and the base of the logarithm.\newlineWe have the function y=log4(9x4x3)y = \log_4(-9x^4 - x^3), where the base of the logarithm is 44.
  2. Apply Chain Rule: Apply the chain rule for differentiation.\newlineThe 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.\newlineIn this case, the outer function is log4(u)\log_4(u) and the inner function is u=9x4x3u = -9x^4 - x^3.
  3. Differentiate Outer Function: Differentiate the outer function with respect to the inner function.\newlineThe derivative of log4(u)\log_4(u) with respect to uu is 1uln(4)\frac{1}{u \cdot \ln(4)}, where ln\ln is the natural logarithm.
  4. Differentiate Inner Function: Differentiate the inner function with respect to xx. The inner function is u=9x4x3u = -9x^4 - x^3. Its derivative with respect to xx is dudx=36x33x2\frac{du}{dx} = -36x^3 - 3x^2.
  5. Apply Chain Rule Multiplication: Apply the chain rule by multiplying the derivatives from Step 33 and Step 44.\newlineThe derivative of yy with respect to xx is dydx=1(9x4x3ln(4))(36x33x2)\frac{dy}{dx} = \frac{1}{(-9x^4 - x^3 \cdot \ln(4))} \cdot (-36x^3 - 3x^2).
  6. Simplify Expression: Simplify the expression.\newlineWe can factor out 3x2-3x^2 from the numerator to get dydx=3x2(12x+1)ln(4)(9x4x3)\frac{dy}{dx} = \frac{-3x^2(12x + 1)}{\ln(4)(-9x^4 - x^3)}.
  7. Check for Simplifications: Check for any possible simplifications or cancellations. There are no further simplifications or cancellations that can be made without changing the domain of the original function.

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