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Which of the following expressions is a polynomial?

Answer and explanation

Correct answer: \(3x^2-5x+7\)

In \(3x^2-5x+7\), the powers of \(x\) are \(2\), \(1\), and \(0\). All are non-negative integers, so it is a polynomial. In option B, \(\frac{2}{x}=2x^{-1}\) has a negative exponent; option C contains \(x^{1/2}\), and option D contains \(x^{-3}\), so they are not polynomials. Exam tip: in a polynomial, every variable exponent must be \(0,1,2,\ldots\).

Related tags

PolynomialsAlgebraic ExpressionsExponentsClass 9 MathematicsPolynomial IdentificationIntroduction To PolynomialsMathematicsClass 9 Mcq

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