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A student claims that \(9x^2-24xy+16y^2\) factorises as \((3x-4y)^2\). Why is the claim correct?

Answer and explanation

Correct answer: क्योंकि \((3x-4y)^2=9x^2-24xy+16y^2\)

The first and last terms are \((3x)^2\) and \((4y)^2\). Using \((a-b)^2=a^2-2ab+b^2\), the middle term is \(-2(3x)(4y)=-24xy\), so A is correct. In exams, always check the sign of the middle term.

Related tags

FactorisationAlgebraic IdentitiesPerfect Square TrinomialClass 9 MathematicsBinomial SquareExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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