Question

найти х
-5=3х^2+6х-2

Answer 1

3x^2 + 6x - 2 = - 5
3x^2 + 6x + 3 = 0  /:3
x^2 + 2x + 1 =0 
D = 4 - 4 = 0
(x + 1)^2 = 0 
x + 1  = 0 
x =  - 1