Question

Find the sum of the infinite series
1+x+x^2+x^3

Answer 1

I need help please

Answer 2

have you tried to replace infinity in to X?

Answer 3

\[ \sum_{i=0}^\infty x^i = \dfrac{1}{1-x}\text{ for }|x|<1\]Otherwise it diverges.

Answer 4

Ok thank you so much