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What is the degree of (x^5(x^2+1)-x^2(x^5-4))?

Answer and explanation

Correct answer: 5

On expanding, \(x^5(x^2+1)-x^2(x^5-4)=x^7+x^5-x^7+4x^2=x^5+4x^2\). The \(x^7\) terms cancel out. The highest power of \(x\) in the remaining polynomial is 5, so its degree is 5. Option 7 would result from ignoring this cancellation. Exam tip: simplify a polynomial and combine like terms before finding its degree.

Related tags

PolynomialsDegree Of PolynomialExpansionCancellationAlgebraic ExpressionsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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