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If n = 1, what will be the degree of (n² − 1)x⁴ + (n + 2)x² − 6?

Answer and explanation

Correct answer: 2

The governing concept is that the degree must be found after substituting the given value and simplifying; a term whose coefficient becomes zero must be removed. Put n=1 into the expression. Then n²−1=1²−1=0, so the coefficient of x⁴ is zero and the x⁴ term disappears. Also, n+2=1+2=3, so the remaining expression is 3x²−6. The highest power of x with a non-zero coefficient is 2. Therefore the degree is 2 and option C is correct. Option A incorrectly counts the original x⁴ term even though its coefficient vanishes. Option B is not the highest surviving power, and option D would apply only if the result were a non-zero constant, which it is not.

Related tags

PolynomialDegreeSubstitutionDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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