Löse die folgenden quadratischen Gleichungen ax² + bx + c = 0

-2.5x² + 27.5x - 60 = 0
 x1 = 3 ,   x2 = 8
-2.5x² - 15x = 0
 x1 = -6 ,   x2 = 0
-6.5x² + 45.5x - 65 = 0
 x1 = 2 ,   x2 = 5
-10x² - 130x - 360 = 0
 x1 = -9 ,   x2 = -4
-5.5x² + 88x - 330 = 0
 x1 = 6 ,   x2 = 10
-3.5x² + 7x + 168 = 0
 x1 = -6 ,   x2 = 8
x² - 2x - 8 = 0
 x1 = -2 ,   x2 = 4
5x² - 50x + 120 = 0
 x1 = 4 ,   x2 = 6
-7x² - 42x - 56 = 0
 x1 = -4 ,   x2 = -2
10x² - 100x + 160 = 0
 x1 = 2 ,   x2 = 8
10x² + 90x = 0
 x1 = -9 ,   x2 = 0
-4.5x² - 58.5x - 180 = 0
 x1 = -8 ,   x2 = -5
8.5x² + 51x - 136 = 0
 x1 = -8 ,   x2 = 2
2.5x² + 15x - 17.5 = 0
 x1 = -7 ,   x2 = 1
-3x² - 12x + 180 = 0
 x1 = -10 ,   x2 = 6
8.5x² - 17x - 204 = 0
 x1 = -4 ,   x2 = 6
-1.5x² - 16.5x - 27 = 0
 x1 = -9 ,   x2 = -2
6x² - 30x - 84 = 0
 x1 = -2 ,   x2 = 7
3.5x² - 35x = 0
 x1 = 0 ,   x2 = 10
5.5x² - 77x + 269.5 = 0
 x1 = 7 ,   x2 = 7