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What is the degree of p(x) = 0x^5 + 7x^3 − 2x + 1?

Answer and explanation

Correct answer: 3

The governing rule is that the degree of a non-zero polynomial is the greatest exponent whose coefficient is non-zero. Although 0x^5 is visibly written, its coefficient is zero, so that term is identically zero and does not affect the polynomial. After removing it, the expression is 7x^3 − 2x + 1. The non-zero powers are 3, 1, and 0, and the greatest of these is 3. Therefore the degree is 3, making option B correct. Option C is the common mistake of selecting the largest exponent printed in the expression without checking its coefficient. Option A corresponds only to the linear term, and option D is a coefficient rather than a possible degree here. The zero coefficient must always be considered before deciding the degree.

Related tags

DegreeZero-CoefficientPolynomialsPolynomials In One VariableMathematicsClass 10 Mcq

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