15 x ² + 2 x − 1 = 0
Вычислим дискриминант.
D = b ² − 4 a c = 64
x 1 , 2 = -b ± √D = -2 ± √64 = -2 ± 8
2a 30 30
X1 = 1/5. X2 = -1/3
