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Which of the following polynomials can be written as the square of the sum of three variables?

Answer and explanation

Correct answer: \(x^2+y^2+z^2+2xy+2yz+2zx\)

In \((x+y+z)^2\), the square terms appear along with twice each pairwise product. Hence A is correct. In B, the mixed-term coefficients are 1, not 2. Exam tip: check every mixed-term coefficient.

Related tags

Algebraic IdentitiesPerfect SquareTrinomial SquarePolynomial IdentificationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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