Question

rozwiąż nierówność

-20-x+1>0

Answer 1

To jest z funkcji kwadratowej:)

 

a= -20 b= -1 c= 1

 

delta = (-1) do kwadrtu -  4 * ( -20) * 1

delta = 1 + 80

delta = 81 a pierwiastek z tego 9

 

x1 = -b-pierwiastek z delty                                         x2  =   -b + pierwiastek z delty

       ----------------------------------                 v           ---------------------------------------

                   2a                                                                            2a

 

x1     1-9                                                    v               x2 =   1+9

       -------                                                                          --------

       2 * ( -20)                                                                       2 * ( -20)

 

x1 =  -8                                                    v                   10

      -------                                                                 --------------

       -40                                                                       -40

 

x1 = 5                                                     v              x2 =  - 1/4

 

 

I rysujemy parabole ramiona w dół bo współczynik a jest minusowy -20 to w dół

 

 

 

---------------------- - 1/4 ---------------- 5-------------- >

 

 

Licze na Naj:D