If $f(x)=e^{x} g(x), g(0)=4, g^{\prime}(0)=2$, then $f^{\prime}(0)=$

If $f(x)=e^{x} g(x), g(0)=4, g^{\prime}(0)=2$, then $f^{\prime}(0)=$
  1. 4
  2. 6
  3. 1
  4. 2

Solution

Given $f(x)=e^{x} g(x)$ $\begin{aligned} \therefore f^{\prime}(x) &=e^{x} g^{\prime}(x)+g(x) \cdot e^{x} \\ \therefore f^{\prime}(0) &=e^{0} g^{\prime}(0)+g(0) \cdot e^{0} \\ &=2+4=6 \end{aligned}$

Asked in: MHT CET 2020 (14 Oct Shift 2)

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