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Which option is a cubic polynomial in x?

Answer and explanation

Correct answer: 2x³ − √5x² + 1

The governing concept is the definition and degree of a polynomial. In a polynomial in x, every exponent of x must be a non-negative integer, such as 0, 1, 2 or 3. The degree is the greatest exponent whose coefficient is not zero. Option A is 2x³ − √5x² + 1; its exponents are 3, 2 and 0, so it satisfies the polynomial definition and has degree 3. The coefficient √5 is an allowed real coefficient and does not cause a problem. Thus option A is cubic. Option B contains x^−1 because 1/x=x^−1, so it is not a polynomial. Option C has the fractional exponent 3/2, which is not allowed, while option D has highest exponent 1 and is therefore linear, not cubic.

Related tags

PolynomialCubic-PolynomialDegreeDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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