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If (b=-4), what will be the degree of ((b+4)x^{14}+8x^5-1)?

Answer and explanation

Correct answer: 5

On substituting \(b=-4\), we get \(b+4=0\). Hence, the term \((b+4)x^{14}\) becomes zero, and the expression reduces to \(8x^5-1\). The highest power of \(x\) in the remaining polynomial is \(5\), so its degree is \(5\). Although \(14\) appears in the original expression, that term is not counted because its coefficient becomes zero. Exam tip: check whether the coefficient of the highest-power term becomes zero after substitution.

Related tags

PolynomialsDegree Of PolynomialParametersCoefficientAlgebraClass 9 MathematicsDegree Of A PolynomialIntroduction To Polynomials

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