Löse die folgenden quadratischen Gleichungen x² + px + q = 0

x² + x - 306 = 0
 x1 = -18 ,   x2 = 17
x² - 34x + 280 = 0
 x1 = 14 ,   x2 = 20
x² - 9 = 0
 x1 = -3 ,   x2 = 3
x² - 24x + 143 = 0
 x1 = 11 ,   x2 = 13
x² - 10x + 16 = 0
 x1 = 2 ,   x2 = 8
x² - 20x = 0
 x1 = 0 ,   x2 = 20
x² + 11x + 30 = 0
 x1 = -6 ,   x2 = -5
x² - 21x + 20 = 0
 x1 = 1 ,   x2 = 20
x² - 5x - 50 = 0
 x1 = -5 ,   x2 = 10
x² - 14x + 45 = 0
 x1 = 5 ,   x2 = 9
x² - 30x + 209 = 0
 x1 = 11 ,   x2 = 19
x² - 18x + 45 = 0
 x1 = 3 ,   x2 = 15
x² - 11x - 152 = 0
 x1 = -8 ,   x2 = 19
x² + 8x - 48 = 0
 x1 = -12 ,   x2 = 4
x² + 11x = 0
 x1 = -11 ,   x2 = 0
x² - 11x - 102 = 0
 x1 = -6 ,   x2 = 17
x² + 18x + 45 = 0
 x1 = -15 ,   x2 = -3
x² - x - 342 = 0
 x1 = -18 ,   x2 = 19
x² + 12x = 0
 x1 = -12 ,   x2 = 0
x² - 11x + 18 = 0
 x1 = 2 ,   x2 = 9