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Which expression is a polynomial even though it has a fractional coefficient?

Answer and explanation

Correct answer: \(3x^2+\frac{5}{8}x-2\)

\(3x^2+\frac{5}{8}x-2\) is a polynomial because the exponents of \(x\) are \(2\), \(1\), and \(0\), all of which are non-negative integers. Polynomial coefficients may be fractions, so \(\frac{5}{8}\) is allowed. In options B and D, \(x\) is in the denominator, which gives a negative exponent; option C has the fractional exponent \(\frac{1}{2}\). Exam tip: while identifying a polynomial, check that every variable exponent is a non-negative integer.

Related tags

PolynomialsDefinition Of PolynomialFractional CoefficientsExponentsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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