tolong kerjakan pakai cara kerja terima kasi.

rasio=(U2/U1)=(U3/U2),,,=(x-1)/(x+2)=(x-7)/(x-1),,,=(x-1)(x-1)=(x-7)(x-1),,,=x²-2x+1=x²-5x-14,,,,=3x=-15,,,x=-5,,, jadi rasionya adlah  (-5-1)/(-5+2) = -6/-3= 2,,,semoga membantu.....