Question

9х^2 - 12х - 5 = 0
Решите пожалуйста.

Answer 1

D = 12*12+9*4*5 = 324
x1 = (12+18)/9*2 = 5/3 = 1 2/3
x2 = (12-18)/9*2 = -6/18 = -1/3