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Which of the following quadratic expressions is a perfect-square trinomial?

Answer and explanation

Correct answer: \(x^2+12x+36\)

A perfect-square trinomial has the form \(x^2+2ax+a^2=(x+a)^2\). In option A, \(36=6^2\) and the middle term is \(12x=2\times 6\times x\). Therefore, \(x^2+12x+36=(x+6)^2\). Option D has the constant term \(36\), but a square ending in \(6^2\) must have middle term \(12x\), not \(6x\). Exam tip: take the square root of the constant term and compare twice that value with the coefficient of the middle term.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPerfect Square TrinomialClass 9 MathematicsPolynomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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