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What is the degree of (x^7(x^2+1)-x^2(x^7-6))?

Answer and explanation

Correct answer: 7

On expanding the expression,
\(x^7(x^2+1)-x^2(x^7-6)=x^9+x^7-x^9+6x^2=x^7+6x^2\). The highest power of \(x\) in the simplified polynomial is 7, so its degree is 7. Option 9 is incorrect because the \(x^9\) terms cancel each other. Exam tip: Always expand and combine like terms before finding the degree of a polynomial.

Related tags

PolynomialsDegree Of PolynomialExpansionCancellationAlgebraic ExpressionsClass 9 MathematicsDegree Of A PolynomialIntroduction To Polynomials

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