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**ti-89 titanium urgent help**

I have been using the ti-89 over over a year now and have never come across this problem. I went to the numeric solver category in the APPS menu and put in a numeric value. When I went back and put in an expression to be factored ex. (x^2-36). It gave me the answer -1*2*5, when the answer is (x-6)(x+6). I went back and deleted the numeric value but it still counts whenever I put in an expression to be factored. PLEASE HELP ME WITH THIS PROBLEM