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(x+y)² -z² =
(x+y-z)(x+y+z)
(x²-2xy+y²)-z²=(x- 1y)(x- 1y)-z²=(x-y)²-z²=(x-y-z)(x-y+z)
Agrupa términos:
(x^2 + 2xy + y^2) -z^2
Factoriza:
(x + y)^2 - z^2
Tenemos una diferencia de cuadrados, donde A^2 - B^2 = (A + B)(A - B)
x + y = A
z = B
(x + y + z)(x + y - z)