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

-2x4 + 16x2 = 0
 x1 = 2.83  x2 = -2.83
x3 = 0  x4 = 0		-6x4 - 60x2 - 144 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-x4 + 4x2 - 3 = 0
 x1 = 1  x2 = -1
x3 = 1.73  x4 = -1.73		-2x4 - 24x2 - 40 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-8x4 - 144x2 - 640 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-8.5x4 + 68x2 - 127.5 = 0
 x1 = 1.73  x2 = -1.73
x3 = 2.24  x4 = -2.24
-4.5x4 - 72x2 - 270 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-x4 = 0
 x1 = 0  x2 = 0
x3 = 0  x4 = 0
-7.5x4 - 22.5x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊		6x4 - 54x2 + 108 = 0
 x1 = 2.45  x2 = -2.45
x3 = 1.73  x4 = -1.73
7.5x4 - 37.5x2 + 45 = 0
 x1 = 1.41  x2 = -1.41
x3 = 1.73  x4 = -1.73		-0.5x4 - 2.5x2 + 7 = 0
 x1 = ◊  x2 = ◊
x3 = 1.41  x4 = -1.41
-7.5x4 - 37.5x2 + 105 = 0
 x1 = 1.41  x2 = -1.41
x3 = ◊  x4 = ◊		10x4 + 80x2 = 0
 x1 = ◊  x2 = ◊
x3 = 0  x4 = 0
8x4 - 104x2 + 336 = 0
 x1 = 2.65  x2 = -2.65
x3 = 2.45  x4 = -2.45		6x4 - 30x2 - 84 = 0
 x1 = 2.65  x2 = -2.65
x3 = ◊  x4 = ◊
8.5x4 - 93.5x2 + 204 = 0
 x1 = 2.83  x2 = -2.83
x3 = 1.73  x4 = -1.73		x4 + 4x2 = 0
 x1 = ◊  x2 = ◊
x3 = 0  x4 = 0
-2.5x4 + 2.5x2 + 30 = 0
 x1 = 2  x2 = -2
x3 = ◊  x4 = ◊		1.5x4 + 12x2 + 24 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊