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kali akar2 = -1/2
PKB yang akar-akarnya (2u + 3) dan (2v + 3) adalah
x² - (2u + 2v + 6)x + (2u + 3) (2v + 3) = 0
x² - (2(u + v) + 6)x + 4uv + 6u + 6v + 9 = 0
x² - (2(3/2) + 6)x + 4.(-1/2) + 6(u + v) + 9 = 0
x² - (3 + 6)x - 2 + 6.3/2 + 9 = 0
x² - 9x - 2 + 9 + 9 = 0
x² - 9x + 16 = 0