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

Answer and explanation

Correct answer: (3)

The direct answer is option C: the degree is \(3\). Add like powers carefully: \(p(x)+q(x)=(5x^4-2x^2+1)+(-5x^4+3x^3+x-6)\). The fourth-degree terms cancel: \(5x^4-5x^4=0\). The remaining polynomial is \(3x^3-2x^2+x-5\). Its highest power with a non-zero coefficient is 3, so its degree is 3. Option A, 1, is wrong because the \(x^3\) and \(x^2\) terms remain. Option B, 2, ignores the non-zero \(3x^3\) term. Option C is correct. Option D, 4, would be correct only if the fourth-degree terms did not cancel. Never decide the degree from the original expressions before adding them. Memory cue: combine first, then read the highest surviving power.

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DegreeCancellationAddition

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