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If the degree of 2x^m + 7x^4 − 5 is 4 and m < 4, which value of m is possible?

Answer and explanation

Correct answer: m = 2

The degree of a polynomial is the greatest exponent attached to a term with a non-zero coefficient. The term 7x^4 is already present, so the polynomial has degree at least 4. The condition m < 4 requires the exponent in 2x^m to be strictly smaller than 4; consequently, that term cannot create a degree greater than 4. Among the choices, only m = 2 satisfies the strict inequality, and the highest exponent remains 4. Therefore, option D is correct. Values m = 6 and m = 5 violate m < 4 and would raise the degree. Although m = 4 would preserve degree 4, it fails the stated strict condition.

Related tags

Degree Of PolynomialUnknown ExponentAlgebraic ReasoningClass 9Degree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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