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What is the degree of ((x^4+2x)(x^5-x)-x^9)?

Answer and explanation

Correct answer: 6

On expanding and simplifying, \((x^4+2x)(x^5-x)-x^9=x^9-x^5+2x^6-2x^2-x^9=2x^6-x^5-2x^2\). The \(x^9\) terms cancel each other. The highest power in the remaining polynomial is \(6\), so its degree is 6. Option 9 is incorrect because the \(x^9\) term does not remain after simplification. Exam tip: Always expand and combine like terms before finding the degree.

Related tags

PolynomialsDegree Of PolynomialExpansionCancellationAlgebraClass 9 MathematicsDegree Of A PolynomialIntroduction To Polynomials

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