You can't do inequalitys in solver, only equalitys. Do abs(x-20)=4 in solver and find the 2 roots, then test values in between each of these to find the acceptance regions. Sorry if this is confusing. brick wrote in message <356C07E7.65D1@hotmail.com>... >Can any one please tell me how to go about solving a simple equation >such as "abs (x-20)>4" useing the ti 86 Ive tried solver but I seem to >being doing something wrong .