Löse die folgenden biquadratischen Gleichungen ax4 + bx2 + c = 0

8x4 + 40x2 - 112 = 0
 x1 = ◊  x2 = ◊
x3 = 1.41  x4 = -1.41		3x4 + 45x2 + 150 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
0.5x4 - 9x2 + 40 = 0
 x1 = 3.16  x2 = -3.16
x3 = 2.83  x4 = -2.83		-8.5x4 - 51x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊
2x4 - 2x2 - 24 = 0
 x1 = 2  x2 = -2
x3 = ◊  x4 = ◊		5.5x4 - 71.5x2 + 165 = 0
 x1 = 1.73  x2 = -1.73
x3 = 3.16  x4 = -3.16
0.5x4 - 32 = 0
 x1 = 2.83  x2 = -2.83
x3 = ◊  x4 = ◊		5.5x4 + 22x2 + 16.5 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
4x4 - 16x2 + 12 = 0
 x1 = 1  x2 = -1
x3 = 1.73  x4 = -1.73		-10x4 - 10x2 + 560 = 0
 x1 = 2.65  x2 = -2.65
x3 = ◊  x4 = ◊
3.5x4 + 70x2 + 350 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-10x4 + 40x2 + 210 = 0
 x1 = ◊  x2 = ◊
x3 = 2.65  x4 = -2.65
1.5x4 + 3x2 - 120 = 0
 x1 = 2.83  x2 = -2.83
x3 = ◊  x4 = ◊		-x4 - 3x2 + 70 = 0
 x1 = 2.65  x2 = -2.65
x3 = ◊  x4 = ◊
5.5x4 - 22x2 = 0
 x1 = 0  x2 = 0
x3 = 2  x4 = -2		3.5x4 + 17.5x2 = 0
 x1 = ◊  x2 = ◊
x3 = 0  x4 = 0
5.5x4 - 16.5x2 - 22 = 0
 x1 = ◊  x2 = ◊
x3 = 2  x4 = -2		-9x4 + 18x2 + 432 = 0
 x1 = 2.83  x2 = -2.83
x3 = ◊  x4 = ◊
-6x4 + 600 = 0
 x1 = 3.16  x2 = -3.16
x3 = ◊  x4 = ◊		-6x4 + 42x2 - 60 = 0
 x1 = 2.24  x2 = -2.24
x3 = 1.41  x4 = -1.41