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If (c=0), what will be the degree of (cx^8+(c+2)x^5-4x+1)?

Answer and explanation

Correct answer: (5)

The degree of a non-zero polynomial is the greatest exponent of the variable whose coefficient is not zero. A term disappears completely when its coefficient becomes zero, so it must not be considered while finding the degree. This is especially important when a parameter is given a particular value, because that value may remove the term with the largest-looking exponent.

Put \(c=0\) into the expression. The coefficient of \(x^8\) becomes \(c=0\), so that term vanishes. The coefficient of \(x^5\) becomes \(c+2=2\), so the polynomial still contains the non-zero term \(2x^5\). The other terms have lower powers, namely \(-4x\) and \(1\). Therefore the greatest remaining exponent is \(5\), so option B is correct.

Related tags

PolynomialDegreeParameter

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