If $f (x) = 8 x^{3}, g (x) = x^{\frac{1}{3}},$ then $f o g (x)$ is

8 x

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8^{3} x

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(8 x)^{\frac{1}{3}}

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8 x^{3}

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Solution

The correct option is A $8 x$
Given that $f (x) = 8 x^{3}, g (x) = x^{\frac{1}{3}},$
$\Rightarrow f o g (x) = f (g (x)) = 8 (g (x))^{3} = 8 (x^{\frac{1}{3}})^{3} = 8 x$

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