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Convexity of $f(x) = g^2(x)$, where $g(x) = \max\{2 + x, x, x^2 - 4\}$ [closed]

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How can we prove the convexity (convex or concave) of the function $$f(x) = g^2(x),$$ where $g(x) = \max\{2 + x, x, x^2 - 4\}$?

Any hints will be highly appreciated!


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