Question 844947
{{{ graph( 300, 300, -10,10,-5,25,-2x^2+12x+3) }}}
The max. occurs when {{{df/dx=0}}}.
{{{df/dx=-4x+12=0}}}
{{{-4x=-12}}}
{{{x=3}}}
{{{f(3)=-2(3)^2+12(3)+3}}}
{{{f(3)=-18+36+3}}}
{{{f(3)=21}}}