Question

True or False: ddxf(5x)=5f(5x)\frac{d}{d x} f(5 x)=5 \cdot f^{\prime}(5 x).

Solution

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We need to find out ddx(f(5x))\dfrac{d}{dx}(f(5x)), This is a composite function of form f(g(x)). where g(x)g(x) Using Chain rule formula for differentiating a composite function of form f(g(x)) . We know that ddx(f(g(x))=f(g(x).g(x)\boxed{\dfrac{d}{dx}(f(g(x))=f'(g(x).g'(x)}

ddx(f(5x))=f(5x)ddx(5x)=f(5x)(5)ddx(f(5x))=5f(5x)\begin{align*} \dfrac{d}{dx}(f(5x))&=f'(5x)\dfrac{d}{dx}(5x)\\ &=f'(5x)(5)\\ \dfrac{d}{dx}(f(5x))&=5f'(5x) \end{align*}

So given equation ddx(f(5x))=5f(5x)\dfrac{d}{dx}(f(5x))=5f'(5x) is True

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