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Which is the correct factorisation of ((a+b)^2-4c^2)?

Answer and explanation

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

The expression can be written as \((a+b)^2-4c^2=(a+b)^2-(2c)^2\). Applying \(x^2-y^2=(x-y)(x+y)\), where \(x=a+b\) and \(y=2c\), gives \((a+b-2c)(a+b+2c)\). Option B would give \((4c)^2=16c^2\), so it is incorrect. Exam tip: treat a complete bracket such as \((a+b)\) as one term when applying an identity.

Related tags

FactorisationDifference Of SquaresAlgebraic IdentitiesClass 9 MathematicsPolynomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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