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Which expression is a polynomial in (x) and can include \(\pi\) as a coefficient?

Answer and explanation

Correct answer: \(\pi x^2-3x+1\)

In \(\pi x^2-3x+1\), the powers of \(x\) are \(2,1,0\), all non-negative integers. Since \(\pi\) is a real number, it may be a coefficient of a polynomial. In B, the exponent of \(x\) is \(-2\); in C, \(\sqrt{x}=x^{\tfrac12}\); and in D, \(\frac{1}{x}=x^{-1}\). Hence, none of these is a polynomial. Exam tip: in a polynomial, variable exponents can only be \(0,1,2,\ldots\).

Related tags

Polynomial DefinitionReal CoefficientsPi CoefficientNon-Negative ExponentsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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