Odpowiedź :
[tex](a_2)^2=a_1\cdot{a_3}\\x^2=(x+2)(x+11)\\x^2=x^2+11x+2x+22\\x^2-x^2-11x-2x=22\\-13x=22\quad|:(-13)\\x=-\frac{22}{13}[/tex]
[tex](a_2)^2=a_1\cdot{a_3}\\x^2=(x+2)(x+11)\\x^2=x^2+11x+2x+22\\x^2-x^2-11x-2x=22\\-13x=22\quad|:(-13)\\x=-\frac{22}{13}[/tex]