Question 1127527
{{{f(a+h)=6(a+h)^2-2(a+h)+7}}}
{{{6(a^2+2ah+h^2)-2a-2h+7}}}
{{{6a^2+12ah+6h^2-2a-2h+7}}}



{{{f(a)=6a^2-2a+7}}}



{{{(f(a+h)-f(a))/h}}}
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{{{(1/h)(6a^2+12ah+6h^2-2a-2h+7-6a^2+2a-7)}}}

{{{(12ah+6h^2-2a-2h+2a)/h}}}

{{{(12ah+6h^2-2h)/h}}}


{{{highlight(12a+6h-2)}}}