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Which of the following expressions is a polynomial in x of degree 3?

Answer and explanation

Correct answer: \(7x^3-2x+5\)

In \(7x^3-2x+5\), the highest power of x is 3, and all powers of x are non-negative integers. Hence, it is a polynomial in x of degree 3. \(x^3+\frac{1}{x}\) contains \(x^{-1}\), while \(\sqrt{x}+x^3\) contains \(x^{1/2}\), so neither is a polynomial. \(x^4-1\) is a polynomial, but its degree is 4. Exam tip: in a polynomial, powers of the variable must be non-negative integers such as 0, 1, 2, and 3.

Related tags

PolynomialsDegree Of PolynomialAlgebraic ExpressionsClass 9 MathematicsPolynomial IdentificationDegree Of A PolynomialIntroduction To PolynomialsMathematics

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