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

8x4 + 72x2 + 64 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-9x4 - 153x2 - 648 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-9.5x4 - 38x2 - 38 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		x4 + 3x2 - 10 = 0
 x1 = ◊  x2 = ◊
x3 = 1.41  x4 = -1.41
-3.5x4 - 10.5x2 + 245 = 0
 x1 = 2.65  x2 = -2.65
x3 = ◊  x4 = ◊		3x4 + 30x2 + 72 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-8.5x4 + 59.5x2 + 255 = 0
 x1 = 3.16  x2 = -3.16
x3 = ◊  x4 = ◊		9.5x4 + 161.5x2 + 665 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
7x4 - 7x2 - 210 = 0
 x1 = 2.45  x2 = -2.45
x3 = ◊  x4 = ◊		-6.5x4 - 6.5x2 + 13 = 0
 x1 = ◊  x2 = ◊
x3 = 1  x4 = -1
8.5x4 + 8.5x2 - 476 = 0
 x1 = ◊  x2 = ◊
x3 = 2.65  x4 = -2.65		7x4 - 98x2 + 315 = 0
 x1 = 3  x2 = -3
x3 = 2.24  x4 = -2.24
-2x4 - 6x2 - 4 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-5x4 + 50x2 - 105 = 0
 x1 = 1.73  x2 = -1.73
x3 = 2.65  x4 = -2.65
10x4 - 50x2 - 140 = 0
 x1 = 2.65  x2 = -2.65
x3 = ◊  x4 = ◊		6x4 + 36x2 - 240 = 0
 x1 = ◊  x2 = ◊
x3 = 2  x4 = -2
8.5x4 - 93.5x2 + 153 = 0
 x1 = 3  x2 = -3
x3 = 1.41  x4 = -1.41		-7x4 + 84x2 - 189 = 0
 x1 = 1.73  x2 = -1.73
x3 = 3  x4 = -3
-4x4 + 52x2 - 120 = 0
 x1 = 3.16  x2 = -3.16
x3 = 1.73  x4 = -1.73		-1.5x4 + 6 = 0
 x1 = ◊  x2 = ◊
x3 = 1.41  x4 = -1.41