(2x-5), (x-4), (-3x+10) merupakan tiga suku pertama barisan geometri. nilai x adalah...

U1= 2x -5
U2 = x-4
U3 = -3x+10
r =U2/U1
r = U3/U2
U2/U1= U3/U2
(x-4)/(2x-5) =(-3x+10)/(x-4)
(x-4)(x-4) = (2x-5)(-3x+10)
x^2 -8x +16 = -6x^2 +35x -50
7x^2 -43x + 66 = 0
(7x - 22)( x - 3 )=0
7x-22=0 v x-3 =0
x= 22/7 v x = 3