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If the degree of 2x^n + 9x^12 − 4 is n and n > 12, which value of n is possible?

Answer and explanation

Correct answer: n = 15

The degree of a polynomial is the greatest exponent of the variable whose coefficient is non-zero. Here the coefficient of x^n is 2, so the x^n term definitely exists. The condition n>12 means that this exponent is larger than the exponent 12 in 9x^12. Therefore the degree is indeed n, provided n is greater than 12. Among the given choices, only n=15 satisfies that strict inequality. The values n=10 and n=8 are smaller than 12, and n=12 is equal to 12 rather than greater than 12. Thus option C is the only possible answer. The non-zero coefficient 2 is important because it prevents the leading term from disappearing.

Related tags

PolynomialDegreeUnknown ExponentIntroduction To PolynomialsDegree Of A PolynomialMathematicsClass 9 Mcq

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