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What is the expression \(4x^2+\sqrt{5}x-9\)?

Answer and explanation

Correct answer: Polynomial

This is a polynomial because the powers of \(x\) are \(2\), \(1\), and \(0\), all of which are non-negative integers. Since \(\sqrt{5}\) is a real number, it can be a valid coefficient of \(x\). A zero polynomial has all coefficients equal to zero, which is not the case here. Exam tip: in a polynomial, variable powers must be \(0,1,2,\ldots\); coefficients may also be irrational.

Related tags

PolynomialsDefinition Of PolynomialReal CoefficientsNon-Negative Integer PowersClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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