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If e = 3, what is the degree of (e − 3)x¹² + (e + 2)x¹⁰ + 6x⁴ − 7?

Answer and explanation

Correct answer: 10

The governing rule is that the degree of a nonzero polynomial is the greatest exponent with a nonzero coefficient. Substitute e = 3 into the coefficients. For x^12, e − 3 = 3 − 3 = 0, so the term 0x^12 disappears completely. For x^10, e + 2 = 3 + 2 = 5, so the term 5x^10 remains. The expression therefore becomes 5x^10 + 6x^4 − 7. Its surviving exponents are 10, 4, and 0, and the greatest is 10. Hence option B is correct. Option A mistakenly retains the cancelled x^12 term. Option C is only the degree of the x^4 term, while option D represents the constant term rather than the polynomial’s degree.

Related tags

Degree Of A PolynomialParameter SubstitutionLeading TermPolynomial SimplificationIntroduction To PolynomialsMathematicsClass 9 Mcq

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