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If (k=5), what will be the degree of ((k-5)x^7+4x^3-x+2)?

Answer and explanation

Correct answer: (3)

The degree of a polynomial is determined only after substituting any given parameter value and removing zero terms. It is the highest exponent of x that still has a non-zero coefficient. A term may appear to have the greatest power initially, but it does not contribute to the degree if its coefficient becomes zero.

For \\(k=5\\), the coefficient of \\(x^7\\) is \\(k-5=5-5=0\\), so the seventh-degree term disappears. The expression becomes \\(4x^3-x+2\\). The non-zero powers present are 3, 1, and 0, and the greatest of these is 3. Thus option C is correct. Options A and B incorrectly retain or misidentify the vanished seventh-degree term.

Related tags

PolynomialParameter SubstitutionDegree

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