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For which value of u will ((u^2 − 36)x^10 + (u+6)x^5 + 7) have degree 0?

Answer and explanation

Correct answer: u = −6

A polynomial has degree 0 exactly when it is a nonzero constant: every term containing a positive power of x must have zero coefficient, while the constant term must remain nonzero. Here the x^10 coefficient requires u^2−36=0, so u=6 or u=−6. The x^5 coefficient requires u+6=0, giving u=−6. The common solution is therefore u=−6. Substitution gives (36−36)x^10+0x^5+7=7, a nonzero constant, so its degree is 0. Option B is correct. At u=6, the x^5 coefficient is 12, leaving degree 5. At u=0, both variable terms remain, and u=36 also leaves a nonzero x^10 coefficient.

Related tags

Polynomial DegreeConstant PolynomialSimultaneous Coefficient ConditionsClass 9Degree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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