Question 847879
{{{2x+y=60}}}
{{{y=60-2x}}}
{{{f=x^2+y^2}}}
{{{f=x^2+(60-2x)^2}}}
{{{f=x^2+3600-240x+4x^2}}}
{{{f=5x^2-240x+3600}}}
Find the derivative and set it equal to zero.
{{{df/dx=10x-240=0}}}
{{{x=24}}}
{{{y=60-2(24)=12}}}
{{{f=24^2+12^2=720}}}