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Let the non-zero polynomials \(p(x)\) and \(q(x)\) both have degree \(n\), and suppose that \(p(x)+q(x)\) is also non-zero. Which condition is necessary and sufficient for the degree of \(p(x)+q(x)\) to be less than \(n\)?

Answer and explanation

Correct answer: The coefficients of \(x^n\) are additive inverses of each other

The \(x^n\) terms are the highest-degree terms in both polynomials. If their coefficients add to zero, these terms cancel, so the remaining non-zero sum has degree below \(n\). Constant terms do not control degree. Exam tip: compare leading coefficients first.

Related tags

PolynomialsDegree Of PolynomialLeading CoefficientCancellation Of TermsClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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