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Choose the correct factorised form of (3a^2+5ab-2b^2).

Answer and explanation

Correct answer: \((3a-b)(a+2b)\)

Expanding \((3a-b)(a+2b)\) gives \(3a^2+6ab-ab-2b^2=3a^2+5ab-2b^2\). Therefore, option A is correct. Expanding option B gives a middle term of \(-5ab\), whereas the given expression has \(+5ab\). Exam tip: while checking factors, add the two cross-products and verify the sign of the middle term.

Related tags

FactorisationAlgebraic IdentitiesQuadratic ExpressionsBinomial ProductsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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