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If a = 0 and b ≠ 0, what will be the degree of ax⁶ + bx⁴ + x − 1?

Answer and explanation

Correct answer: 4

The governing concept is that the degree of a polynomial is the greatest exponent of the variable whose coefficient is non-zero after all given conditions are applied. Here, a = 0, so ax⁶ = 0 and the sixth-degree term disappears completely. Since b ≠ 0, bx⁴ remains a non-zero term. The terms x and −1 have powers 1 and 0, both smaller than 4. Thus the simplified polynomial is bx⁴ + x − 1, and its highest surviving power is 4. Therefore option B is correct. Option A counts the term that vanished, option C ignores the surviving fourth-degree term, and option D ignores all variable terms.

Related tags

Degree Of PolynomialZero CoefficientPolynomial TermsDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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