Question

explain in your own words why (x+y)2=x2+y2.provide a numerical example to illustrate discussion rubric

Answer 1

$(x+y)^2 \\=x(x+y)+y(x+y) \\=x^2 + xy+yx+y^2 \\=x^2+2xy+y^2$

so it does not equal x^2 +y^2