## Algebra: A Combined Approach (4th Edition)

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