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(x -5 ) ( x -(-9)) = 0
(x -5) (x + 9)
x^2 - 9x - 5x + 81
x^2 - 14x + 81 = 0
2. penambahannya (1/2 x 2)^2 = 1^2 = 1
bentuk kuadrat sempurnanya
x^2 + 2x + 1 = 0