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What is the factor form of ( p^2-18p+81 )?

Answer and explanation

Correct answer: \((p-9)^2\)

Using the identity \((a-b)^2=a^2-2ab+b^2\), put \(a=p\) and \(b=9\). Then \((p-9)^2=p^2-18p+81\). Hence, the correct factor form is \((p-9)^2\). The expression \((p+9)^2\) has middle term \(+18p\), so it is not correct. Exam tip: for a perfect-square trinomial, halve the coefficient of the middle term and check whether its square equals the constant term.

Related tags

Algebraic IdentitiesFactorisationPerfect Square TrinomialSquare Of BinomialClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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