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If the degree of 2x^n + 5x^7 - 3 is n and n > 7, which value of n is possible?

Answer and explanation

Correct answer: n = 8

The governing concept is that the degree of a polynomial is the greatest exponent of x with a non-zero coefficient. In 2x^n + 5x^7 - 3, the coefficient of x^n is 2, which is non-zero. The question additionally states n > 7, so the x^n term has a higher power than x^7 and must determine the degree. We therefore need an option whose value is greater than 7. Among the choices, only n = 8 satisfies that condition, and then the polynomial has degree 8. Options n = 5 and n = 3 violate n > 7, while n = 7 does not satisfy the strict inequality and would also make the highest powers equal rather than establish the stated condition. Hence option C is the unique valid answer.

Related tags

PolynomialDegreeUnknown ExponentInequality ConditionDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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