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Which polynomial has degree 4 and a negative leading coefficient?

Answer and explanation

Correct answer: −5x⁴ + x² − 7

The degree of a non-zero polynomial is the greatest exponent of x with a non-zero coefficient. The leading coefficient is the coefficient of the term having that greatest exponent. Option B, −5x⁴+x²−7, has highest exponent 4, so its degree is 4, and the coefficient of x⁴ is −5, which is negative. It therefore satisfies both conditions and is correct. Option A also has degree 4, but its leading coefficient is +3, so it fails the sign requirement. Option C has a negative leading coefficient, but its highest exponent is 3, giving degree 3 rather than 4. Option D is linear with degree 1. Thus option B is the only unambiguous answer. The revised options are polynomials themselves, avoiding any confusion caused by quotient notation.

Related tags

PolynomialDegreeLeading-CoefficientDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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