SIMPLIFY
(a) (x + y + z)(x + y – z)
(b) x power 2(x – 3y power 2) – xy(y power 2 – 2xy) – x(y power 3 – 5x power 2)
(c) 2x2(x + 2) – 3x (x2 – 3) – 5x(x + 5)
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Step-by-step explanation:
a.( x+y+z)(x+y-z)
= 2x+xy-xz. xy+2y-yz. zx+zy-2z
=2x+2y+2z
=2(x+y+z)
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