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Which expression is a polynomial in (x) but not a linear polynomial in (x)?

Answer and explanation

Correct answer: \(x^3+1\)

In \(x^3+1\), the powers of \(x\) are 3 and 0, both non-negative integers, so it is a polynomial in \(x\). Its highest power is 3, making it a cubic polynomial rather than a linear polynomial. \(5x-2\) is linear because its degree is 1. In \(\frac{1}{x}+2\) and \(\sqrt{x}+1\), the powers of \(x\) are \(-1\) and \(\frac12\), so they are not polynomials. Exam tip: variable exponents in a polynomial must be 0 or positive integers.

Related tags

PolynomialsDegree Of PolynomialLinear PolynomialCubic PolynomialAlgebraDegree Of A PolynomialIntroduction To PolynomialsMathematics

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