If $y=\log \left[\mathrm{e}^{5 x}\left(\frac{3 x-4}{x+5}\right)^{\frac{4}{3}}\right]$, then…

If $y=\log \left[\mathrm{e}^{5 x}\left(\frac{3 x-4}{x+5}\right)^{\frac{4}{3}}\right]$, then $\frac{\mathrm{d} y}{\mathrm{~d} x}$ is equal to
  1. $5+\frac{4}{3 x-4}-\frac{4}{3(x+5)}$
  2. $5+\frac{4}{3(3 x-4)}-\frac{4}{3(x+5)}$
  3. $5 x+\frac{4}{3 x-4}-\frac{4}{3(x+5)}$
  4. $5+\frac{12}{3 x-4}-\frac{4}{(x+5)}$

Solution

$\begin{aligned} y & =\log \left[\mathrm{e}^{5 x}\left(\frac{3 x-4}{x+5}\right)^{\frac{4}{3}}\right] \\ \therefore \quad y & =5 x \log \mathrm{e}+\frac{4}{3} \log (3 x-4)-\frac{4}{3} \log (x+5) \\ \therefore \quad \frac{\mathrm{d} y}{\mathrm{~d} x} & =5+\frac{4}{3(3 x-4)} \times 3-\frac{4}{3(x+5)} \times 1 \\ & =5+\frac{4}{(3 x-4)}-\frac{4}{3(x+5)}\end{aligned}$

Asked in: MHT CET 2024 (03 May Shift 1)

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