Work Step by Step
$(x-1)(x^3+3x-1)$ $=x(x^3+3x-1)-(x^3+3x-1)$ $=x^4+3x^2-x-x^3-3x+1$ $=x^4-x^3+3x^2-4x+1$ The highest degree of term is 4, so the degree of polynomial would be 4, and not 5.
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