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Which quadratic expression can be written as the product of two identical linear factors?

Answer and explanation

Correct answer: \(x^2-6x+9\)

In \(x^2-6x+9\), the first and last terms are \(x^2\) and \(3^2\), while the middle term is \(-2\times x\times3=-6x\). Hence \(x^2-6x+9=(x-3)(x-3)=(x-3)^2\). Option A has unequal factors. Exam tip: check whether the middle term is \(\pm2ab\).

Related tags

Algebraic IdentitiesQuadratic ExpressionsPerfect Square TrinomialFactorisationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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