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Ravi says that the expression \(5x^3-\sqrt{x}+2\) is a polynomial. Which is the correct evaluation of his statement?

Answer and explanation

Correct answer: It is not a polynomial because \(\sqrt{x}=x^{1/2}\) has a non-integer exponent of the variable.

In a polynomial, every exponent of the variable must be a non-negative integer. Here, \(\sqrt{x}=x^{1/2}\), so the expression is not a polynomial. An integer exponent in \(x^3\) alone is not enough. Exam tip: rewrite radicals as fractional powers before checking.

Related tags

PolynomialsDefinition Of PolynomialExponentsRadicalsClass 9 MathematicsMisconception CheckDefinition Of A PolynomialIntroduction To Polynomials

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