Calculate the Average Rate between the points (4,f(4))\displaystyle {\left({4},{f{{\left({4}\right)}}}\right)}(4,f(4)) and (8,f(8))\displaystyle {\left({8},{f{{\left({8}\right)}}}\right)}(8,f(8)) for the funcion f(x)=10x2−4x\displaystyle {f{{\left({x}\right)}}}={10}{x}^{{2}}-{4}{x}f(x)=10x2−4x.
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