Explicación paso a paso:
1. (x+y+z) (x+y-z)=
x+y^2-z^2
x^2+2xy+y^2-z^2
2. (s+w+z) (s+w-z)=
(s+w)^2-z^2
s^2+2sw+w^2-z^2
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Explicación paso a paso:
1. (x+y+z) (x+y-z)=
x+y^2-z^2
x^2+2xy+y^2-z^2
2. (s+w+z) (s+w-z)=
(s+w)^2-z^2
s^2+2sw+w^2-z^2