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b² - 4ac = 0
(2k-1)² - 4(k+2)(k-1) = 0
4k² - 4k + 1 - 4(k² + k - 2) = 0
4k² - 4k + 1 - 4k² - 4k + 8 = 0
-8k + 9 = 0
-8k = -9
k = 9/8
semoga membantu ya :)