i have absolutely no idea what this answer is i worked on it for 15 minutes could i get some help please

Use the function nest to evaluate p(x) = 1 + x + · · · + x50 at x = 1.00001. (use the matlab ones command to save typing.) find the error of the computation by comparing with the equivalent expression q(x) = (x51 − 1)/(x − 1).

What is the binomial expansion of (2x-3)^5

Describe the domain and range of y=2(3)^x-2+5