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If \(t\neq0\), what is the degree of \(tx^{13}+0x^{15}+4x^6-2\)?

Answer and explanation

Correct answer: (13)

Polynomial degree is determined by the largest exponent attached to a term with a nonzero coefficient. A written term with coefficient zero is not part of the effective polynomial. The condition \(t\neq0\) guarantees that the term \(tx^{13}\) cannot disappear, so its exponent must be considered when comparing the remaining terms.

The term \(0x^{15}\) contributes nothing and cannot make the degree 15. The other terms have powers 13, 6, and 0. Since \(t\neq0\), the power-13 term is present, and 13 is the greatest nonzero power. Therefore the degree is 13, so option B is correct. Choosing 15 would incorrectly treat a zero term as an actual term.

Related tags

PolynomialZero CoefficientParameter

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