If x + y = - Z, then the value of (x ^ 2-y ^ 2) + (XZ YZ) is___
x+y=-z
(x^2-y^2)+(xz-yz)
=(x+y)(x-y)+z(x-y)
=-z(x-y)+z(x-y)
=0
RELATED INFORMATIONS
- 1. x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2 =[x(y+z)-y(x-z)]^2 =(xz+yz)^2 =z^2(x+y)^2
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