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Which of the following trinomials can be factorised as the product of two identical binomials because it is a perfect square?

Answer and explanation

Correct answer: \(4p^2-20pq+25q^2\)

In option A, the first and last terms are \((2p)^2\) and \((5q)^2\). Its middle term is \(-2(2p)(5q)=-20pq\), so it equals \((2p-5q)^2\). Option B has an incorrect middle-term coefficient. Exam tip: for a perfect square trinomial, always check whether the middle term is \(\pm2ab\).

Related tags

FactorisationAlgebraic IdentitiesPerfect Square TrinomialClass 9 MathematicsBinomial SquareExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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