b, (x^5 - 1)/(x^2 - 1) = (x^4 + x^3 + x^2 + x + 1)/(x + 1)

b, $\frac{x^{5} - 1}{x^{2} - 1} = \frac{x^{4} + x^{3} + x^{2} + x + 1}{x + 1}$