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If t ≠ 0, what is the degree of tx^13 + 0x^15 + 6x^4 − 8?

Answer and explanation

Correct answer: 13

The governing concept is that the degree of a nonzero polynomial is the greatest exponent of the variable whose coefficient is nonzero. The term 0x^15 does not contribute, even though it displays the largest exponent, because its coefficient is zero and the entire term equals zero. Since t ≠ 0, the term tx^13 is present with a nonzero coefficient. The other nonzero terms are 6x^4 and −8, having degrees 4 and 0. Therefore the greatest exponent attached to a nonzero term is 13, so option B is correct. Option A incorrectly counts the zero term, while options C and D overlook the surviving thirteenth-degree term.

Related tags

Degree Of PolynomialZero CoefficientLeading TermIntroduction To PolynomialsMathematicsClass 9 McqDegree Of A Polynomial

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