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What is the degree of ((x^6+3x^2)(x^7-x^3)-x^{13})?

Answer and explanation

Correct answer: (9)

When multiplying polynomials, every term in the first factor must be multiplied by every term in the second factor. Like powers can then be combined, and any term that is subtracted may cancel an identical term. The degree is determined only after this simplification, because the apparent highest power may disappear.

Expand the product: \(x^6(x^7-x^3)=x^{13}-x^9\), and \(3x^2(x^7-x^3)=3x^9-3x^5\). Adding gives \(x^{13}+2x^9-3x^5\). Subtracting \(x^{13}\) cancels the degree-13 term, leaving \(2x^9-3x^5\). The highest remaining exponent is 9, so option B is correct. Choosing 13 would overlook the cancellation.

Related tags

PolynomialProductCancellation

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