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Which of the following is a quadratic expression in \(x\) and \(y\)?

Answer and explanation

Correct answer: \(3x^2-2xy+y^2+5\)

Every variable term in \(3x^2-2xy+y^2+5\) has total degree 2; for example, the degree of \(xy\) is \(1+1=2\). Hence A is quadratic. In B, each term has degree 3. Exam tip: add exponents in each term to identify its degree.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesPolynomial DegreeBivariate PolynomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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