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-(16 - 24a²)/8a = 1
-16 + 24a²/8a = 1
-16 + 24a² = 8a
24a² - 8a - 16 = 0
bagi 8 kedua ruas
3a² - a - 2 = 0
(3a + 2) (a - 1) = 0
a = -2/3 , a = 1
mempunyau nilai maksimum maka a < 0
sehingga pilih a = -2/3
27a³ - 9a = 27.-8/27 - 9.-2/3 = -8 + 6 = -2 = A