| 6.5x4 + 58.5x2 = 0 x1 = 0 x2 = 0x3 = ◊ x4 = ◊ | 4x4 + 48x2 + 128 = 0 x1 = ◊ x2 = ◊x3 = ◊ x4 = ◊ |
| 5x4 - 45x2 = 0 x1 = 3 x2 = -3x3 = 0 x4 = 0 | -7x4 + 63x2 - 140 = 0 x1 = 2.24 x2 = -2.24x3 = 2 x4 = -2 |
| 1.5x4 - 21x2 + 72 = 0 x1 = 2.83 x2 = -2.83x3 = 2.45 x4 = -2.45 | 5.5x4 - 16.5x2 - 297 = 0 x1 = ◊ x2 = ◊x3 = 3 x4 = -3 |
| -x4 - 10x2 = 0 x1 = 0 x2 = 0x3 = ◊ x4 = ◊ | -6x4 - 72x2 - 216 = 0 x1 = ◊ x2 = ◊x3 = ◊ x4 = ◊ |
| -4.5x4 - 22.5x2 - 18 = 0 x1 = ◊ x2 = ◊x3 = ◊ x4 = ◊ | 8.5x4 - 17x2 - 127.5 = 0 x1 = ◊ x2 = ◊x3 = 2.24 x4 = -2.24 |
| 8.5x4 + 42.5x2 + 51 = 0 x1 = ◊ x2 = ◊x3 = ◊ x4 = ◊ | -7x4 - 84x2 - 224 = 0 x1 = ◊ x2 = ◊x3 = ◊ x4 = ◊ |
| -9.5x4 - 47.5x2 + 475 = 0 x1 = 2.24 x2 = -2.24x3 = ◊ x4 = ◊ | -6.5x4 + 234 = 0 x1 = ◊ x2 = ◊x3 = 2.45 x4 = -2.45 |
| 8x4 + 40x2 + 48 = 0 x1 = ◊ x2 = ◊x3 = ◊ x4 = ◊ | -10x4 + 60x2 - 50 = 0 x1 = 1 x2 = -1x3 = 2.24 x4 = -2.24 |
| 5.5x4 - 82.5x2 + 275 = 0 x1 = 3.16 x2 = -3.16x3 = 2.24 x4 = -2.24 | -5.5x4 + 5.5x2 + 231 = 0 x1 = ◊ x2 = ◊x3 = 2.65 x4 = -2.65 |
| 5x4 - 50x2 + 105 = 0 x1 = 1.73 x2 = -1.73x3 = 2.65 x4 = -2.65 | -9.5x4 - 38x2 + 114 = 0 x1 = 1.41 x2 = -1.41x3 = ◊ x4 = ◊ |