Question

Помогите zквадрат+6z-7 меньше или ровно 0

Answer 1

z^2 + 6z - 7 ≤ 0
D = 36 + 28 = 64
        
         -6 + 8                                 -6 - 8
x1 = ------------- = 1              x2 = ---------------- = -7
             2                                        2

     +                 -                +
------------|-------------------|--------------->
            -7                  1

        Ответ:  [ -7 ; 1 ]