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A1 - x² + 6x + 9 = 0 pemfaktoran (x + 3) (x + 3) =0
A2 - x² - 6x + 9 = 0 pemfaktoran (x - 3) (x - 3) =0
jelas bahwa
a-3 = 6 atau a - 3 = -6
jadi
a = 9 atau a = -3