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Choose the correct factorisation of (3x^2+2xy-8y^2).

Answer and explanation

Correct answer: \((3x-4y)(x+2y)\)

Expanding \((3x-4y)(x+2y)\) gives \(3x^2+6xy-4xy-8y^2=3x^2+2xy-8y^2\). Therefore, option A is correct. In option B, the middle term becomes \(-2xy\), not \(2xy\). Exam tip: expand the factors and check the coefficient of the middle term.

Related tags

FactorisationAlgebraic IdentitiesQuadratic ExpressionsBinomial ProductsMiddle TermExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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