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

10x4 + 70x2 - 180 = 0
 x1 = ◊  x2 = ◊
x3 = 1.41  x4 = -1.41
-5x4 - 40x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊
4x4 - 12x2 - 160 = 0
 x1 = 2.83  x2 = -2.83
x3 = ◊  x4 = ◊
-9.5x4 + 95x2 - 228 = 0
 x1 = 2.45  x2 = -2.45
x3 = 2  x4 = -2
-10x4 - 40x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊
8x4 + 48x2 - 56 = 0
 x1 = 1  x2 = -1
x3 = ◊  x4 = ◊
8.5x4 + 8.5x2 - 102 = 0
 x1 = 1.73  x2 = -1.73
x3 = ◊  x4 = ◊
10x4 - 80x2 + 160 = 0
 x1 = 2  x2 = -2
x3 = 2  x4 = -2
-1.5x4 + 9x2 + 60 = 0
 x1 = 3.16  x2 = -3.16
x3 = ◊  x4 = ◊
4x4 + 60x2 + 224 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
-9x4 - 108x2 - 324 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
2.5x4 + 2.5x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊
6.5x4 - 58.5x2 + 117 = 0
 x1 = 1.73  x2 = -1.73
x3 = 2.45  x4 = -2.45
-9.5x4 + 47.5x2 = 0
 x1 = 2.24  x2 = -2.24
x3 = 0  x4 = 0
9.5x4 - 47.5x2 + 57 = 0
 x1 = 1.41  x2 = -1.41
x3 = 1.73  x4 = -1.73
-8x4 + 32x2 + 96 = 0
 x1 = 2.45  x2 = -2.45
x3 = ◊  x4 = ◊
-2.5x4 + 17.5x2 - 25 = 0
 x1 = 2.24  x2 = -2.24
x3 = 1.41  x4 = -1.41
2.5x4 - 12.5x2 - 15 = 0
 x1 = 2.45  x2 = -2.45
x3 = ◊  x4 = ◊
-6.5x4 + 58.5x2 - 117 = 0
 x1 = 2.45  x2 = -2.45
x3 = 1.73  x4 = -1.73
8.5x4 - 850 = 0
 x1 = 3.16  x2 = -3.16
x3 = ◊  x4 = ◊