Question 469285
{{{((x+y)^2)/(x^2+y^2)}}}



{{{((2+4)^2)/(2^2+4^2)}}}



{{{((2+4)^2)/(4+16)}}}



{{{(6^2)/(4+16)}}}



{{{(36)/(4+16)}}}



{{{(36)/(20)}}}



{{{9/5}}}



So {{{((x+y)^2)/(x^2+y^2)=9/5}}} when {{{x=2}}} and {{{y=4}}}