Answer :

We know that,


(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2za


Using this formula, we get


= (-3x)2 + (4y)2 + (2z)2 + 2(-3x) (4y) + 2 (4y) (2z) + 2 (2z) (-3x)


= (-3x + 4y + 2z)2


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