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Which of the following is the algebraic identity for the square of a sum of three terms?

Answer and explanation

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

The correct identity is \((a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca\). On squaring, every distinct pair occurs twice. Option A misses the factor 2. Exam tip: check all three pairs: ab, bc, and ca.

Related tags

Algebraic IdentitiesSquare Of TrinomialClass 9 MathematicsPolynomial ExpansionAlgebraExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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