$f (x) = x^{9} + 3 x^{7} + 6$ is increasing in

(- \infty, \infty)

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(- \infty, 0)

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(0, \infty)

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\emptyset

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Solution

The correct option is A $(- \infty, \infty)$
$f^{'} (x) = 9 x^{8} + 21 x^{6}$
$f^{'} (x) > 0$ $\forall x ϵ R$

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