Question

X в квадрате -14x+49<=0

Answer 1

x^2-14x+49<=0

x^2-14x+49=0

д=14^2-4*49=0

x=14/2=7

(x-7)(x-7)= (x-7)^2<=0

 <--------------------------------------|                                                

===============(черная  точка)===================

                   +                           +7                       +