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If \(t\neq0\), what is the degree of \(tx^{11}+0x^{12}+3x^5-1\)?

Answer and explanation

Correct answer: (11)

The degree of a polynomial in one variable is the greatest exponent of that variable whose coefficient is not zero. A term with coefficient zero contributes nothing and must be ignored, even if its written exponent is larger than the exponents of the other terms. The condition \(t\neq0\) is essential because it confirms that \(tx^{11}\) is genuinely present and has a nonzero coefficient.

Here, \(0x^{12}\) is the zero term, so it cannot determine the degree. The remaining relevant powers are 11, 5, and 0, from \(tx^{11}\), \(3x^5\), and \(-1\). The greatest of these is 11. Therefore the polynomial has degree 11, making option B correct. Option A incorrectly counts the zero term.

Related tags

PolynomialZero CoefficientParameter

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