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After simplifying (5x^7(x^2-1)-5x^9+2x^6), what is the degree?

Answer and explanation

Correct answer: 7

On simplifying, \(5x^7(x^2-1)-5x^9+2x^6=5x^9-5x^7-5x^9+2x^6=-5x^7+2x^6\). The terms \(5x^9\) and \(-5x^9\) cancel. The highest power of \(x\) in the remaining polynomial is 7, so its degree is 7. Option 9 is incorrect because the \(x^9\) terms become zero after simplification. Exam tip: Expand brackets and combine like terms before finding the degree.

Related tags

PolynomialsDegree Of PolynomialAlgebraic SimplificationLike TermsTerm CancellationDegree Of A PolynomialIntroduction To PolynomialsMathematics

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