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If (b=-2), what will be the degree of ((b+2)x^{12}+5x^6-4)?

Answer and explanation

Correct answer: 6

On substituting \(b=-2\), we get \(b+2=0\). Hence, the coefficient of \(x^{12}\) is zero, so that term disappears. The remaining polynomial is \(5x^6-4\), whose highest power of \(x\) is 6. Therefore, its degree is 6. Choosing 12 would be incorrect because the \(x^{12}\) term has zero coefficient. Exam tip: substitute the given parameter value and remove zero-coefficient terms before finding the degree.

Related tags

PolynomialsDegree Of PolynomialSubstitutionZero CoefficientAlgebraDegree Of A PolynomialIntroduction To PolynomialsMathematics

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