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After simplifying (x^6(x^4-2)-x^{10}+3x^7-9), what is the degree?

Answer and explanation

Correct answer: (7)

The direct answer is option B, degree 7. First distribute \(x^6\): \(x^6(x^4-2)=x^{10}-2x^6\). The whole polynomial becomes \(x^{10}-2x^6-x^{10}+3x^7-9\). The like terms \(x^{10}-x^{10}\) cancel to zero, leaving \(3x^7-2x^6-9\). The highest exponent with a non-zero coefficient is 7, so the degree is 7. Option A, 10, is wrong because the two degree-10 terms cancel. Option B, 7, is correct. Option C, 6, is wrong because the non-zero term \(3x^7\) has a higher exponent than \(-2x^6\). Option D, 4, is unrelated; no degree-4 term remains. Always simplify before finding degree, because leading terms can cancel. Memory cue: degree means the largest exponent that survives with a non-zero coefficient.

Related tags

PolynomialExpansionCancellation

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