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Given the function \newlinef(x)=(9x5)13,f(x)=(-9x-5)^{\frac{1}{3}}, find \newlinef(x)f'(x) in any form.

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Q. Given the function \newlinef(x)=(9x5)13,f(x)=(-9x-5)^{\frac{1}{3}}, find \newlinef(x)f'(x) in any form.
  1. Identify function: Identify the function to differentiate.\newlineWe are given the function f(x)=(9x5)13f(x) = (-9x - 5)^{\frac{1}{3}}, which is a composition of functions. We need to find its derivative f(x)f'(x).
  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. In this case, the outer function is u(1/3)u^{(1/3)} and the inner function is u=9x5u = -9x - 5.
  3. Differentiate outer function: Differentiate the outer function with respect to the inner function.\newlineLet u=9x5u = -9x - 5. Then the outer function is u(1/3)u^{(1/3)}. The derivative of u(1/3)u^{(1/3)} with respect to uu is (1/3)u(2/3)(1/3)u^{(-2/3)}.
  4. Differentiate inner function: Differentiate the inner function with respect to xx. The derivative of u=9x5u = -9x - 5 with respect to xx is dudx=9\frac{du}{dx} = -9.
  5. Apply chain rule multiplication: Apply the chain rule by multiplying the derivatives from Step 33 and Step 44.\newlinef'(x) = \left(\frac{d}{dx} of the outer function evaluated at the inner function\) ×\times \left(\frac{d}{dx} of the inner function\)\newlinef(x)=(13)(9x5)23×(9)f'(x) = \left(\frac{1}{3}\right)\left(-9x - 5\right)^{-\frac{2}{3}} \times (-9)
  6. Simplify derivative: Simplify the expression for the derivative. f(x)=3(9x5)23f'(x) = -3(-9x - 5)^{-\frac{2}{3}}

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