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After simplifying (7x^9(x^2-1)-7x^{11}+6x^8), what is the degree?

Answer and explanation

Correct answer: 9

First expand: \(7x^9(x^2-1)=7x^{11}-7x^9\). Thus, the expression becomes \(7x^{11}-7x^9-7x^{11}+6x^8=-7x^9+6x^8\). The \(x^{11}\) terms cancel, and the highest remaining exponent is 9, so the degree is 9. Option 8 is the exponent of the other remaining term, not the highest one. Exam tip: Always simplify a polynomial completely before finding its degree.

Related tags

PolynomialsDegree Of PolynomialAlgebraic SimplificationExpansionCancellationDegree Of A PolynomialIntroduction To PolynomialsMathematics

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