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Which expression is a polynomial but not of degree (2)?

Answer and explanation

Correct answer: \(6x^4-x+3\)

In \(6x^4-x+3\), the powers of \(x\) are \(4\), \(1\), and \(0\). All are non-negative integers, so it is a polynomial. Its highest power is \(4\), therefore it is not a polynomial of degree \(2\). \(x^2+5x+6\) is a degree-\(2\) polynomial. \(\sqrt{x}+2\) and \(\frac{1}{x}+x^2\) are not polynomials because they contain powers \(\frac{1}{2}\) and \(-1\), respectively. Exam tip: in a polynomial, variable exponents must be non-negative integers, and the greatest exponent gives the degree.

Related tags

PolynomialsDegree Of PolynomialQuadratic PolynomialExponentsClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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