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Which trinomial is the product of two identical linear factors?

Answer and explanation

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

The direct answer is A: \(x^2-12x+36=(x-6)^2=(x-6)(x-6)\). For two identical linear factors, the expression must be a perfect square. Comparing with \((x-k)^2=x^2-2kx+k^2\), the middle coefficient \(-12\, gives \(2k=12\), so \(k=6\). The constant term must then be \(6^2=36\), which matches A. B has the same first two terms but its constant term is 24, not 36, so it is not a perfect square. C has a positive middle term and a negative constant, so it cannot equal the square of a real linear binomial in this form. D is a difference of squares, \((x-6)(x+6)\), whose factors are different, not identical. A quick check is to take half the magnitude of the middle coefficient and square it.

Related tags

Perfect-Square TrinomialIdentical FactorsFactorisationLinear FactorsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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