Find the radius and disk of convergence

timer Asked: Dec 16th, 2014

Question description


please i need it bu this method

General form of power series is  sum   an (z-center)^n

so  the value of radius =  limit |an| / |an+1 |

n: infinity

then the convergent is  less than the radius

but must note : if the radius is zero  the convergent become point zero   , if infinity is all

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