How to use a second wireless router as a extender?

my wireless connection (netgear 79) fluctuates often from 5 bar signal dropping to 1 - computer repairman suggested programming an extender into router...my computer is only 8 ft. from router in another room...would a second router do better and/or easier to implement
please advise
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  1. The computer is only 8 feet from the router ? Why don't you connect with an ethernet cable ?
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