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What is the degree of the sum of (p(x)=6x^5-4x^2+1) and (q(x)=-6x^5+3x^4+x-9)?

Answer and explanation

Correct answer: (4)

The direct answer is option C: the degree is \(4\). Add the polynomials term by term: \((6x^5-4x^2+1)+(-6x^5+3x^4+x-9)\). The fifth-degree terms cancel because \(6x^5-6x^5=0\). The sum becomes \(3x^4-4x^2+x-8\). The highest non-zero power is 4, so the degree is 4. Option A, 2, is wrong because the \(x^4\) term remains. Option B, 3, is wrong because there is no non-zero \(x^3\) term and it overlooks the fourth-degree term. Option C is correct. Option D, 5, is wrong because the fifth-degree terms cancel completely. The degree of a sum may be lower than the degrees of the original polynomials when leading terms cancel. Exam cue: always check cancellation of the highest powers.

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DegreeCancellationAddition

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