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If s = 1, what is the degree of (s − 1)x⁴ + (s + 3)x³ + 2?

Answer and explanation

Correct answer: 3

The degree of a polynomial is the greatest exponent of the variable whose coefficient is nonzero after all given values have been substituted and the expression has been simplified. A term with a zero coefficient disappears and cannot determine the degree. Therefore, it is necessary to substitute s = 1 before inspecting the powers of x.

The expression becomes (1 − 1)x⁴ + (1 + 3)x³ + 2, which simplifies to 0x⁴ + 4x³ + 2, or 4x³ + 2. The fourth-degree term vanishes, but the coefficient of x³ is 4, which is nonzero. Hence the greatest remaining exponent is 3, so option B is correct. The answer is not 4 because the x⁴ term has disappeared, and the constant term does not control the degree.

Related tags

PolynomialsDegreeSubstitutionZero CoefficientDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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