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A student has to identify a polynomial in x. Which of the following expressions is a polynomial in x?

Answer and explanation

Correct answer: \(4x^3-7x+1\)

In \(4x^3-7x+1\), the powers of x are 3, 1 and 0, all non-negative integers, so it is a polynomial. But \(3/x=3x^{-1}\), which is not allowed. Exam tip: reject expressions with negative or fractional powers.

Related tags

PolynomialsDefinition Of PolynomialAlgebraic ExpressionsExponentsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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