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Let \(a,b,c\) be real numbers. Which of the following expressions can always be written as the perfect square of a trinomial?

Answer and explanation

Correct answer: \(a^2+b^2+c^2+2ab+2bc+2ca\)

Option A is the expansion of \((a+b+c)^2\): it contains \(a^2,b^2,c^2\) and the pairwise terms \(2ab,2bc,2ca\). In the other options, one mixed term lacks coefficient 2. Exam tip: in a trinomial square, every pairwise product has coefficient 2.

Related tags

Algebraic IdentitiesPerfect SquareTrinomial ExpansionClass 9 MathematicsPolynomial IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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