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a^3 r^3 = 32.768
ar =∛32.768 = 32
ar = 32
r = 32/a
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a . ar² = 32768/32
a.ar² = 1.024
r² = 1.024/a²
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a + ar + ar² = 292
a + ar² = 292-32
a+ ar² = 260
a ( 1 + r²) = 260
a ( 1 + (1.024/a²) = 260
a + 1.024/a = 260
a²/a + 1.024/a = 260
a² + 1.024 = 260a
a² - 260a + 1.024 = 0
(a - 256) ( a-4) = 0
a = 256 atau a = 4
barisan geo nya = a ar ar²
= 4 , 32 , 256 atau
= 256, 32, 4