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Show that f(x)=x^9+4x^7+11 is an increa...

Show that `f(x)=x^9+4x^7+11` is an increasing function for all `x inRdot`

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`f(x)=x^{9}+4 x^{7}+11`
` f^{prime}(x)=9 x^{8}+28 x^{6} geq 0, forall x in [because x^{8}, x^{6} geq 0, text { for } forall x in R]`
So,` f(x)` is increasing on `R`.
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