[r]
(1)x2 - 16x + 84 = 0
x2 + 2x - = 0
5x2 + 8x + = 0
x2 – 2(x + = 0
11x2 + 13x - 24 = 0
x2 - 11x + 30 = 0
x2 - 13x + 42 = 0
11x2 - 13x - 24 = 0
x2 - 13x + 40 = 0
3x2 + 5x - = 0
5x2 + 7x - = 0
3x2 - 2x - = 0
x2 - 2x + = 0
x2 - 2x - = 0
11x2 + 13x + 24 = 0
x2 + 13x + 42 = 0
11x2 - 13x - 24 = 0
2x2 - 3x - = 0