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Which expression is not quadratic?

Answer and explanation

Correct answer: (x^3+x+1)

Direct answer: option C, \(x^3+x+1\). A quadratic expression has highest power exactly 2, and its general form is \(ax^2+bx+c\) with \(a\) not zero. Option A, \(x^2+2x+1\), has highest power 2, so it is quadratic. Option B, \(3x^2-5\), also has highest power 2; the missing x term is allowed because its coefficient may be zero. Option C has \(x^3\), so its degree is 3 and it is cubic, not quadratic. Option D, \(5x^2\), has degree 2, so it is quadratic even though the x and constant terms are absent. Check the greatest exponent, not the number of terms. Memory cue: degree 2 means quadratic; degree 3 means cubic.

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Quadratic ExpressionsNon QuadraticDegree

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