Prove that if $|g'(x)|\leq M|x-x_0|^n$ with $|x-x_0|<\delta$ then $|g(x)|\leq \frac{M|x-x_0|^{n+1}}{n+1}$

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I really don't know how to proceed. There is similar question here but in that case, they prove that $|g(x)-g(a)|\leq \frac{M|x-x_0|^{n+1}}{n+1}$ instead of just $|g(x)|$ so I got really confused.

I hope that yoy could help me.

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The assertion is not correct. Take $g(x)=x^2+7, x_0=0$ and $n=1$.