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Which of the following expressions is always non-negative for all real values of \(x\) and \(y\)?

Answer and explanation

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

\(x^2+2xy+y^2=(x+y)^2\), a perfect square. The square of every real number is never negative, so this expression is always non-negative. Exam tip: recognise the middle term \(2xy\).

Related tags

Algebraic IdentitiesPerfect SquareNon-Negative ExpressionsBinomial SquareClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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