InterviewSolution
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InterviewSolution
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actorise : 27x3 + ะฃะท + zs_9xyz |
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Answer» 27x^3+ y^3+ z^3- 9xyz = (3x)^3+ y^3+ z^3- 3 × (3x) × y × z = [3x + y + z ][(3x)^2+ y^2+ z^2- (3x) × y − y × z − z(3x)] [Since (a + b + c )(a^2+ y^2+ z^2- ab−bc−ca)] = [3x + y + z ][9x^2+ y^2+ z^2- 3xy − yz − 3zx] |
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