Hey,
Sorry if I am in the wrong part of the forums not sure where this question goes. I am having trouble with a geometric series that has letters involved. I understand the forumla for finding the sum of first n elements with just numbers. However the series i have is ..
a1 = -5, a2 = -5x, a3...
Its neither of those, I've attatched a picture of a screenshot of the question I've been given. This is why I am having trouble with this one because it isn't in a format I've seen before when working with algebriac fractions.