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What is the degree of (x^4(x^2+1)-x^2(x^4-3))?

Answer and explanation

Correct answer: 4

On expanding, \(x^4(x^2+1)-x^2(x^4-3)=x^6+x^4-x^6+3x^2=x^4+3x^2\). The \(x^6\) terms cancel each other. The highest power in the remaining polynomial is \(4\), so its degree is 4. Choosing \(6\) would be an error caused by looking at the powers before simplification. Exam tip: Always simplify a polynomial completely before finding its degree.

Related tags

PolynomialsDegree Of PolynomialExpansionCancellationClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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