Question

Simplify ( x + y + z )( x - y - z )​

Answer 1

Step-by-step explanation:

=X(x-y-z)+y(x-y-z)+z(x-y-z)

=x^2-xy-xz+xy-y^2-xz+xz-yz-z^2

=x^2-y^2-z^2

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Answer 2

Step-by-step explanation:

$= \sf \: (x + y + z)(x + y + z) \\ \sf = {x}^{2} + xy + xz + xy + {y}^{2} + yz + xz + zy + {z}^{2} \\ \sf \: = {x}^{2} + {y}^{2} + {z}^{2} + 2xy + 2xz + 2yz \: ans.$