Question 634857
{{{25(x+y)^2-4(x-y)^2}}}


{{{25(x^2+2xy+y^2)-4(x^2-2xy+y^2)}}}


{{{25x^2+50xy+25y^2-4x^2+8xy-4y^2}}}


{{{21x^2+58xy+21y^2}}}

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So 


{{{25(x+y)^2-4(x-y)^2}}}


simplifies to


{{{21x^2+58xy+21y^2}}}


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