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Two polynomials \(P\) and \(Q\) each have degree 5. A student says that the degree of \(P+Q\) will always be 5. Which example proves the student's statement wrong?

Answer and explanation

Correct answer: \(P=x^5+x^3,\ Q=-x^5+2x^2\)

In option A, \(P+Q=(x^5+x^3)+(-x^5+2x^2)=x^3+2x^2\), which has degree 3. Leading terms may cancel. Exam tip: find the degree only after simplifying the sum.

Related tags

PolynomialsDegree Of PolynomialAddition Of PolynomialsLeading TermClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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