Question

Please Answer These Questions​

Answer 1

1)

We need to find the 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

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