Question 829404
{{{(1/2)((x+y)(x+y)-(x-y)(x-y))=(1/2)((x^2+xy+xy+y^2)-(x^2-xy-xy+y^2))}}}
{{{(1/2)((x+y)(x+y)-(x-y)(x-y))=(1/2)(x^2+2xy+y^2-x^2+2xy-y^2)}}}
{{{(1/2)((x+y)(x+y)-(x-y)(x-y))=(1/2)(4xy)}}}
{{{(1/2)((x+y)(x+y)-(x-y)(x-y))=2xy)}}}
{{{(1/2)((x+y)(x+y)-(x-y)(x-y))=250}}}