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

8.5x4 + 110.5x2 + 306 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-4.5x4 + 4.5x2 + 27 = 0
 x1 = 1.73  x2 = -1.73
x3 = ◊  x4 = ◊
-10x4 - 10x2 + 420 = 0
 x1 = ◊  x2 = ◊
x3 = 2.45  x4 = -2.45		3x4 - 42x2 + 147 = 0
 x1 = 2.65  x2 = -2.65
x3 = 2.65  x4 = -2.65
4x4 - 4x2 - 8 = 0
 x1 = 1.41  x2 = -1.41
x3 = ◊  x4 = ◊		0.5x4 + 1.5x2 - 27 = 0
 x1 = 2.45  x2 = -2.45
x3 = ◊  x4 = ◊
-4x4 - 60x2 - 216 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		0.5x4 + 7.5x2 + 27 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
4x4 - 8x2 + 4 = 0
 x1 = 1  x2 = -1
x3 = 1  x4 = -1		9.5x4 + 85.5x2 + 171 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
0.5x4 + 3x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊		9.5x4 + 47.5x2 = 0
 x1 = ◊  x2 = ◊
x3 = 0  x4 = 0
-10x4 - 100x2 = 0
 x1 = 0  x2 = 0
x3 = ◊  x4 = ◊		10x4 - 30x2 - 540 = 0
 x1 = 3  x2 = -3
x3 = ◊  x4 = ◊
-0.5x4 - 3.5x2 - 6 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		-2.5x4 - 10x2 + 12.5 = 0
 x1 = 1  x2 = -1
x3 = ◊  x4 = ◊
7x4 + 112x2 + 441 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊		7x4 + 105x2 + 392 = 0
 x1 = ◊  x2 = ◊
x3 = ◊  x4 = ◊
6x4 - 6x2 - 36 = 0
 x1 = 1.73  x2 = -1.73
x3 = ◊  x4 = ◊		6.5x4 - 78x2 + 175.5 = 0
 x1 = 1.73  x2 = -1.73
x3 = 3  x4 = -3