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After simplifying (2x^4(x^3-1)-2x^7+9x^5), what is the degree?

Answer and explanation

Correct answer: 5

First expand: \(2x^4(x^3-1)=2x^7-2x^4\). Thus, the expression becomes \(2x^7-2x^4-2x^7+9x^5=9x^5-2x^4\). The highest power with a non-zero coefficient is \(5\), so the degree of the polynomial is 5. Option 7 is incorrect because \(2x^7\) and \(-2x^7\) cancel each other. Exam tip: Expand brackets and combine like terms before finding the degree.

Related tags

PolynomialsDegree Of PolynomialAlgebraic SimplificationLike TermsExponentsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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