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If (A(x)=x^8+7) and (B(x)=-x^8+9x^5), what is the degree of (A(x)+B(x))?

Answer and explanation

Correct answer: 5

\(A(x)+B(x)=(x^8+7)+(-x^8+9x^5)=9x^5+7\). The \(x^8\) terms cancel each other. The highest power with a non-zero coefficient in the remaining polynomial is \(5\), so its degree is \(5\). Choosing \(8\) would be incorrect because no \(x^8\) term remains after addition. Exam tip: always simplify the sum first, then identify the highest power with a non-zero coefficient.

Related tags

PolynomialsDegree Of PolynomialPolynomial AdditionTerm CancellationAlgebraDegree Of A PolynomialIntroduction To PolynomialsMathematics

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