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

3.5x4 - 52.5x2 + 175 = 0
 x1 = 3.16  x2 = -3.16
x3 = 2.24  x4 = -2.24		2x4 - 14x2 + 24 = 0
 x1 = 2  x2 = -2
x3 = 1.73  x4 = -1.73
-6x4 + 48x2 - 72 = 0
 x1 = 1.41  x2 = -1.41
x3 = 2.45  x4 = -2.45		10x4 - 10x2 - 300 = 0
 x1 = 2.45  x2 = -2.45
x3 = ◊  x4 = ◊
3.5x4 + 49x2 + 168 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-9x4 + 108x2 - 315 = 0
 x1 = 2.24  x2 = -2.24
x3 = 2.65  x4 = -2.65
-3x4 + 27x2 + 30 = 0
 x1 = ◊  x2 = ◊
x3 = 3.16  x4 = -3.16		-1.5x4 + 1.5x2 + 9 = 0
 x1 = ◊  x2 = ◊
x3 = 1.73  x4 = -1.73
0.5x4 - 5x2 + 10.5 = 0
 x1 = 2.65  x2 = -2.65
x3 = 1.73  x4 = -1.73		-3.5x4 - 42x2 - 70 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-0.5x4 + 5.5x2 - 12 = 0
 x1 = 1.73  x2 = -1.73
x3 = 2.83  x4 = -2.83		4.5x4 - 31.5x2 = 0
 x1 = 2.65  x2 = -2.65
x3 = 0  x4 = 0
4.5x4 + 67.5x2 + 225 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-0.5x4 + 1.5x2 + 35 = 0
 x1 = 3.16  x2 = -3.16
x3 = ◊  x4 = ◊
6.5x4 + 32.5x2 - 91 = 0
 x1 = 1.41  x2 = -1.41
x3 = ◊  x4 = ◊		7.5x4 - 60x2 + 52.5 = 0
 x1 = 2.65  x2 = -2.65
x3 = 1  x4 = -1
-2.5x4 + 12.5x2 + 90 = 0
 x1 = ◊  x2 = ◊
x3 = 3  x4 = -3		-10x4 - 110x2 - 180 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
4x4 + 56x2 + 192 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-8.5x4 - 110.5x2 - 255 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊