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After simplifying (x^4(x^3+2)-x^7+6x^5-8), what is the degree?

Answer and explanation

Correct answer: 5

First expand: \(x^4(x^3+2)=x^7+2x^4\). Thus, the expression becomes \(x^7+2x^4-x^7+6x^5-8=6x^5+2x^4-8\). The \(x^7\) terms cancel, and the highest power of \(x\) in the remaining polynomial is 5, so its degree is 5. Option 7 is incorrect because the \(x^7\) term does not remain after simplification. Exam tip: expand brackets and combine like terms before finding a polynomial's degree.

Related tags

PolynomialsDegree Of PolynomialSimplificationLike TermsAlgebraic ExpressionsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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