Question

(x+y)²-(x- y)²- ? what is the answer of this​

Answer 1

Answer:

$(x + y )^{2} - (x - y)^{2} \\(x {}^{2} + y ^{2} + 2xy) - (x {}^{2} + y {}^{2} - 2xy) \\ x {}^{2} + y {}^{2} + 2xy - x {}^{2} - y {}^{2} + 2xy \\ 2xy + 2xy \\ = 4xy$