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Which option has degree 3 but the coefficient of x^2 is 0?

Answer and explanation

Correct answer: 2x^3 + 5x - 1

A polynomial can have a missing intermediate power; the missing term is understood to have coefficient zero. In option A, 2x^3 + 5x - 1 has highest power x^3 with non-zero coefficient 2, so its degree is 3. There is no x^2 term, which means its x^2 coefficient is 0. Hence A satisfies both requirements. Options B and D each contain x^2 with coefficient 1, so they fail the second condition. Option C has no x^3 term and its highest power is x^2, so its degree is only 2. The absence of x^2 does not reduce the degree when a higher non-zero x^3 term is present.

Related tags

PolynomialDegreeMissing-TermDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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