Jika (p + 1), (p – 2), (p – 8) , . . . membentuk barisan geometri. tentukan rasionya.

Jawaban:

2

Penjelasan:

U2² = U1.U3

(p-2)² = (p+1)(p-8)

p²-4p+4 = p²-7p-8

-4p+7p = -8-4

3p = -12

p = -12/3 = -4

r = U2/U1

= (-4-2)/(-4+1) = -6/(-3) = 2