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What is the degree of ((x^3+3x)(x^4-x)-x^7)?

Answer and explanation

Correct answer: \(5\)

First, \((x^3+3x)(x^4-x)=x^7+3x^5-x^4-3x^2\). On subtracting \(x^7\), the \(x^7\) terms cancel, leaving \(3x^5-x^4-3x^2\). The highest exponent in the resulting polynomial is \(5\), so its degree is \(5\). Option \(7\) is the highest power before simplification, but it does not remain in the final polynomial. Exam tip: always simplify and combine like terms before deciding the degree.

Related tags

PolynomialsDegree Of PolynomialAlgebraic ExpansionTerm CancellationClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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