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Which of the following quadratic trinomials can be written as the expansion of a perfect-square binomial?

Answer and explanation

Correct answer: \(9x^2-24x+16\)

\(9x^2-24x+16=(3x-4)^2\) because the middle term is \(2\times3x\times(-4)=-24x\). In option B, the constant should be 16, not 15. Exam tip: use square roots of the first and last terms to verify the middle term.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPerfect Square TrinomialBinomial SquareClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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