Question

proof this (x+y+z) (xy+yz+zx)- X Y Z=[(x+y)(y+z)(z+x)]​

Answer 1

Answer:

=(x^2+y)+(y^2+z)+(z^2+x)-( X Y Z)

= take comman

=(X Y Z)( X+y)+ (y+z)+(z+x)- (x y z)

=( x+y)+ (y+z)+(z+x)

hence proved