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ar = 2k-8
ar^2 = 5-k
ar/a = ar^2/ar = r
(2k -8) (2k-8) = (k-1) (5-k)
4k² - 32k + 64 = 5k - k² - 5 + k
4k² - 32k + 64 = 6k - k² - 5
5k² - 38k + 69 = 0
(5k - 23 ) ( k - 3)
k= 23/5 atau k = 3