Question

Fatore as diferença de dois quadrados
(x+y)²-y²
(a+b)²-(a-b)²

Answer 1

$(x+y)^2-y^2\\\\ \ [x+y+(y)]\ [x+y-(y)]\\\\ (x+y+y)(x+y-y)\\\\ (x+2y)(x)\\\\ \fbox{x(x+2y)}\\\\\\ (a+b)^2-(a-b)^2\\\\ \ [ a+b+(a-b)]\ [ a+b-(a-b)]\\\\ (a+b+a-b)(a+b-a+b)\\\\ (2a)(2b)\\\\ \fbox{4ab}$