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6k + 2 = k² + 5k
k² - k - 2 = 0
(k + 1)(k - 2) = 0
k = - 1 atau k = 2
b = (3k + 1) - (3k - 3)
b = 3k + 1 - 3k + 3
b = 4
lalu masukan b ke,
b = (k^2 + 2k + 3) - (3k + 1)
4 = k^2 - k + 2
k^2 - k - 2 = 0
(k - 2) (k + 1) = 0
k = 2 atau k = -1