Answers

2016-04-11T20:07:56+05:30
X,y,z are in AP
 
⇒y=x+z/2

(x+y-z)(-x+y+z)

(x+x+z/2-z)(-x+x+z/2+z)
(2x+x+z-z)(-2X+X+Z+Z)
3x*(-x+2z)
-3x²+6xz

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