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After simplifying (6x^8(x^2-1)-6x^{10}+5x^7), what is the degree?

Answer and explanation

Correct answer: 8

First expand: \(6x^8(x^2-1)=6x^{10}-6x^8\). Therefore, the full expression becomes \(6x^{10}-6x^8-6x^{10}+5x^7=-6x^8+5x^7\). The \(x^{10}\) terms cancel, and the highest power in the remaining polynomial is 8, so its degree is 8. Option 10 is incorrect because the coefficient of \(x^{10}\) becomes zero after simplification. Exam tip: Always expand brackets and combine like terms before finding a polynomial’s degree.

Related tags

PolynomialsDegree Of PolynomialExpansionCancellationLike TermsAlgebraDegree Of A PolynomialIntroduction To Polynomials

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