Hey FRIEND...Here is your answer27x3 + y3 + z3 - 9xyz = (3x)3 + y3 + z3 - 3 × (3x) × y × z = [3x + y + z ][(3x)2 + y2 + Z2 - (3x) × y − y × z − z(3x)] [Since (a + b + c )(a2 + y2 + z2 - ab−bc−ca)] = [3x + y + z ][9x2 + y2 + z2 - 3xy − yz − 3zxI hope it will help you MATE#yahyaahmad#
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