On my TI-89 factor(49-36*d^2) gives me -851 On my HP48GX it gives me -((6*D-7)*(6*D+7)) why are they different? SOME problems do factor correctly for me on the TI-89.... Help! How do I fix my TI-89.... ?? Please e-mail me.. capasso@cyberenet.net Thanks, Joe capasso@cyberenet.net