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If z = −2, what will be the degree of (z + 2)x⁵ + (z² − 4)x³ + 9x − 1?

Answer and explanation

Correct answer: 1

The governing rule is that a polynomial’s degree is found only after substituting the given values and removing terms whose coefficients become zero. Put z = −2. Then z + 2 = −2 + 2 = 0, so (z + 2)x⁵ becomes 0 and the fifth-degree term disappears. Also, z² − 4 = (−2)² − 4 = 4 − 4 = 0, so the cubic term disappears as well. The expression is reduced to 9x − 1. Its highest power with a non-zero coefficient is x¹, so the degree is 1. Therefore option C is correct. Options A and B count terms that vanish after substitution, while D overlooks the surviving term 9x.

Related tags

Degree Of PolynomialSubstitutionZero CoefficientsDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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