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Which expression is a polynomial in (z), not asked in (x)?

Answer and explanation

Correct answer: \(4z^3-2z+9\)

In \(4z^3-2z+9\), the exponents of \(z\) are \(3\), \(1\), and \(0\). All are non-negative integers, so it is a polynomial in \(z\). Options A and C contain \(z^{-1}\), while option D contains \(z^{1/2}\); an expression with a negative or fractional exponent of the variable is not a polynomial. Exam tip: check that every variable exponent is one of \(0,1,2,\ldots\).

Related tags

PolynomialsDefinition Of PolynomialExponentsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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