result of: j=0 indicates x too small j=100 indicates x too large locate: guess j xx(j) xx(j+1) -90.00000 5 0 lower lim -72.948730 -80.00000 10 0 lower lim -72.948730 -70.00000 15 27 -70.142578 -69.944801 -60.00000 20 52 -60.536263 -59.845963 -50.00000 25 63 -50.663937 -49.467468 -40.00000 30 70 -40.884548 -39.186684 -30.00000 35 75 -31.478918 -29.298815 -20.00000 40 79 -22.064632 -19.401850 -10.00000 45 83 -10.566000 -7.313669 0.00000 50 86 -0.300206 3.478463 10.00000 55 88 7.450869 11.626944 20.00000 60 90 16.017132 20.632408 30.00000 65 92 25.484316 30.584986 40.00000 70 94 35.947174 41.584286 50.00000 75 96 47.510418 53.740391 60.00000 80 97 53.740391 60.289780 70.00000 85 99 67.174965 74.413162 80.00000 90 100 74.413162 upper lim 90.00000 95 100 74.413162 upper lim