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What is the complete factorisation of \(12x^2-27y^2\)?

Answer and explanation

Correct answer: \(3(2x-3y)(2x+3y)\)

Answer: A. First find the greatest common factor of both terms: \(12x^2-27y^2=3(4x^2-9y^2)\). The expression inside the brackets is a difference of squares: \(4x^2=(2x)^2\) and \(9y^2=(3y)^2\). Therefore, \(4x^2-9y^2=(2x-3y)(2x+3y)\), giving the complete factorisation \(3(2x-3y)(2x+3y)\). Option D stops after taking out 3, so it is not complete. Option B expands to a different expression. Option C uses an incorrect common factor and incorrect binomials; its expansion does not match. The key habit is to take out a common factor first, then check whether the remaining expression is another special form.

Related tags

Complete FactorisationCommon FactorDifference Of SquaresFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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