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After simplifying (x^7(x^4-3)-x^{11}+5x^8-6), what is the degree?

Answer and explanation

Correct answer: (8)

The direct answer is option B, degree 8. Distribute \(x^7\): \(x^7(x^4-3)=x^{11}-3x^7\). Substitution gives \(x^{11}-3x^7-x^{11}+5x^8-6\). The two degree-11 terms cancel: \(x^{11}-x^{11}=0\). The simplified polynomial is \(5x^8-3x^7-6\), whose highest surviving exponent is 8. Therefore option B is correct. Option A, 11, is wrong because both degree-11 terms disappear. Option B, 8, is correct because \(5x^8\) remains and its coefficient is non-zero. Option C, 7, overlooks the higher surviving term \(5x^8\). Option D, 4, is not present in the simplified expression. The common mistake is to look at the largest exponent before combining like terms. First expand, then cancel, then identify the largest remaining exponent.

Related tags

PolynomialExpansionCancellation

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