Question 1187558
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The average is the change in y (or f(x)) divided by the change in x:<br>
{{{(f(x+h)-f(x))/((x+h)-x) = (f(x+h)-f(x))/h}}}<br>
{{{((5(x+h)^2+7)-(5x^2+7))/h}}}
{{{(5(x^2+2hx+h^2)+7-5x^2-7)/h}}}
{{{(5x^2+10hx+5h^2+7-5x^2-7)/h}}}
{{{(10xh+5h^2)/h}}}
{{{10x+5h}}}<br>
Your answer is correct.<br>