Can someone please help me solve and explain how did you solve the question below? I am helping my friend and it looks like c2/fp1 stuff but I don't remember doing that with x's and not actual numbers, so is that perhaps c3 or something else? Thanks for explanations.
(Original post by WarriorInAWig)
Ignore 1/x for the minute and deal with x+x^2+.... How can you rewrite this? If you can, then you will get a simplified left hand side which can be rearranged and I think will be a quadratic to solve.
I'm sorry I didn't understand what you mean, nor did my friend. How can you ignore 1/x if its first term in the sequence? I tried using a/1-r formula but I would get something like 1/x - 1/x^2 = 3.5 but couldn't solve further, because even if its sort of like quadratic, powers are negative.