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pertama
x = -1 dan x = 6
x + 1 dan x - 6
dijadikan persamaan kuadrat
(x + 1)(x - 6)
x² - 6x + 1x - 6
x² -5x - 6
kedua
x = -3 dan x = -4
x + 3 dan x + 4
dijadikan persamaan kuadrat
(x + 3)(x + 4)
x² + 4x + 3x + 12
x² + 7x + 12