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If \(q(x)=x^2+\sqrt{x}+1\), why is (q(x)) not a polynomial?

Answer and explanation

Correct answer: Because \(\sqrt{x}=x^{\frac{1}{2}}\) has a fractional exponent of \(x\)

In a polynomial, the exponents of the variable must be non-negative integers, such as 0, 1, 2, or 3. Here, \(\sqrt{x}=x^{\frac{1}{2}}\), so the exponent of \(x\) is \(\frac{1}{2}\), which is not an integer. Therefore, \(q(x)\) is not a polynomial. The exponent 2 in \(x^2\) is valid, and the constant term 1 is also allowed; the number of terms does not decide whether an expression is a polynomial. Exam tip: a root of a variable or a fractional exponent signals a non-polynomial.

Related tags

PolynomialsDefinition Of PolynomialFractional ExponentsSquare RootsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To Polynomials

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