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What is the expression \(4x+\sqrt{x}\)?

Answer and explanation

Correct answer: Not a polynomial

As \(\sqrt{x}=x^{\frac{1}{2}}\), the expression contains \(x\) with exponent \(\frac{1}{2}\). In a polynomial, variable exponents must be non-negative integers such as \(0,1,2,\ldots\). Hence, \(4x+\sqrt{x}\) is not a polynomial. While \(4x\) alone is a linear polynomial, the term \(\sqrt{x}\) makes the complete expression non-polynomial. Exam tip: Convert a square root involving a variable into a fractional exponent before checking for a polynomial.

Related tags

PolynomialsDefinition Of PolynomialFractional ExponentsSquare RootsNon-PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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