Given f(x)=x2+4x\displaystyle {f{{\left({x}\right)}}}={x}^{{2}}+{4}{x}f(x)=x2+4x, find the average rate of change of f(x)\displaystyle {f{{\left({x}\right)}}}f(x) on the interval [−4,−4+h]\displaystyle {\left[-{4},-{4}+{h}\right]}[−4,−4+h]. Your answer will be an expression involving h\displaystyle {h}h.
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