Question

3х в квадрате -2х-5 больше нул

Answer 1

3х² - 2х - 5 ≻ 0
D= 4 + 60 = 64

          2 + 8         10         5
x1 = ------------ =  -------- = -------
            6              6          3

        2 - 8
x2= ----------- = -1
           6

      +              -                 +
-----------◯-------------◯------------->
            -1              5/3


                     Ответ: ( -∞ ; -1 ) ⋃ ( 5/3 ; +∞ )