Question

(x + y + z) ( x + y - z)​

Answer 1

Answer:

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Answer 2

We need to find product of (x+y+z) and (x+y−z)

Their product is x(x+y−z)+y(x+y−z)+z(x+y−z)

=x^2+xy−xz+xy+y^2−yz+zx+yz−z^2

=x ^2+y^2−z^2+2xy