Answer:
(x+y+z) (x-y+z)
=(x+z+y) (x+z-y)
=(x+z)²-y²
=x²+2xz+z²-y²
=x²-y²+z²+2xz
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Answer:
(x+y+z) (x-y+z)
=(x+z+y) (x+z-y)
=(x+z)²-y²
=x²+2xz+z²-y²
=x²-y²+z²+2xz