cable modem wifi Signal

I live in small rambler 1800 sq feet.  the office where desktop and cable modem live is on one end of house and on other end where living room is can not use ipad as signal not strong enough.  Some area ok, but others not.  so what model wifi extender would be compatable and work best without a large expense as just got the ac1750 when I dumped Comcast modem.  Also have heard that a Powerline adapter that uses your elecectrical wiring can solve the problem.  I am not astute enough to which or what models would work best and be compatible to provide an improved signal.