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

Answer and explanation

Correct answer: 12

This product has the form

a^2-b^2=(a-b)(a+b)

. Taking

a=x^6

and

b=1

gives

(x^6-1)(x^6+1)=x^{12}-1

. The highest power of

x

in this polynomial is 12, so its degree is 12. Degree 6 is the degree of each factor, not of the complete product. Exam tip: Recognising an identity before multiplying helps find the degree quickly.

Related tags

PolynomialsDegree Of PolynomialDifference Of SquaresAlgebraic IdentitiesClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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