Jika (×+2),(×-1),(×-7),... membentuk barisan geometri,maka rasionya sama dengan
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Jawab:
U1 . U3 = (U2)²
(a + 2) . (a - 7) = (a - 1)²
a² - 5a - 14 = a² - 2a + 1
a² - 5a + 2a = 1 + 14
-3a = 15
a = 15/-3
a = -5
r = U2/U1
r = (a - 1)/(a + 2)
r = (-5 - 1)/(-5 + 2)
r = -6/-3
r = 2
Penjelasan dengan langkah-langkah: