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Which expression is a quadratic expression in (x)?

Answer and explanation

Correct answer: (x^2-4x+7)

Direct answer: option B, \(x^2-4x+7\). A quadratic expression in x must be a polynomial whose highest power of x is 2. Option A, \(3x+5\), has highest power 1, so it is linear. Option B contains \(x^2\) and no higher power, so it is quadratic. Option C, \(x^3+2x\), has highest power 3, so it is cubic. Option D, \(2/x+1\), contains x in the denominator; it can be written with \(x^{-1}\) and is not a quadratic polynomial. Thus B is the only correct choice. Do not decide by how complicated an expression looks; inspect the largest exponent after simplifying. Memory cue: the highest power must be exactly 2.

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Quadratic ExpressionDegreeIdentification

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