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

6x4 - 72x2 + 192 = 0
 x1 = 2.83  x2 = -2.83
x3 = 2  x4 = -2		-4x4 - 56x2 - 192 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
5.5x4 - 16.5x2 - 99 = 0
 x1 = ◊  x2 = ◊
x3 = 2.45  x4 = -2.45		2.5x4 - 15x2 = 0
 x1 = 0  x2 = 0
x3 = 2.45  x4 = -2.45
-5.5x4 + 60.5x2 - 132 = 0
 x1 = 2.83  x2 = -2.83
x3 = 1.73  x4 = -1.73		4x4 + 64x2 + 252 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-3.5x4 + 35x2 - 31.5 = 0
 x1 = 1  x2 = -1
x3 = 3  x4 = -3		-6.5x4 - 19.5x2 - 13 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-8.5x4 - 85x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊		-4x4 + 12x2 + 160 = 0
 x1 = 2.83  x2 = -2.83
x3 = ◊  x4 = ◊
-5.5x4 - 33x2 - 44 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-2.5x4 + 17.5x2 = 0
 x1 = 2.65  x2 = -2.65
x3 = 0  x4 = 0
8x4 - 56x2 - 240 = 0
 x1 = 3.16  x2 = -3.16
x3 = ◊  x4 = ◊		x4 - x2 - 2 = 0
 x1 = ◊  x2 = ◊
x3 = 1.41  x4 = -1.41
4.5x4 + 13.5x2 = 0
 x1 = ◊  x2 = ◊
x3 = 0  x4 = 0		9.5x4 + 104.5x2 + 95 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-7x4 - 56x2 - 84 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		3.5x4 + 24.5x2 - 28 = 0
 x1 = ◊  x2 = ◊
x3 = 1  x4 = -1
8x4 + 56x2 + 48 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		7x4 - 105x2 + 350 = 0
 x1 = 2.24  x2 = -2.24
x3 = 3.16  x4 = -3.16