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If \(t\neq0\), what is the degree of \(tx^{15}+0x^{17}+6x^8-5\)?

Answer and explanation

Correct answer: (15)

The degree of a polynomial is found from the greatest exponent with a nonzero coefficient. A term such as \(0x^{17}\) is identically zero and does not affect the polynomial. The condition \(t\neq0\) confirms that \(tx^{15}\) remains present and must be compared with the lower-power terms.

Once the zero term is ignored, the exponents present are 15, 8, and 0. The largest of these is 15, and its coefficient t is nonzero by assumption. Therefore the degree is 15, so option B is correct. The tempting answer 17 is wrong because the coefficient of \(x^{17}\) is zero; a formal exponent alone cannot determine polynomial degree.

Related tags

PolynomialZero CoefficientParameter

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