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Choose the factorised form of (x^2+7x+12-y^2).

Answer and explanation

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

First, write \(x^2+7x+12=(x+3)(x+4)\). Thus the expression becomes \((x+3)(x+4)-y^2\). Using \(a^2-b^2=(a-b)(a+b)\), it factorises as \((x+3-y)(x+4+y)\). In option B, the \(y^2\) term becomes positive, so it is incorrect. Exam tip: after factorising, expand once to check that the \(-y^2\) term is obtained.

Related tags

FactorisationAlgebraic IdentitiesDifference Of SquaresQuadratic ExpressionsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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