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x1 = 6 atau x2 = -5
2. 9y² + 90y + 225 = (9x + 45) (x + 5)
x1 = -45 :9 = -5
atau
x2 = -5
3. x² + 4x + 3 = (x + 1) (x + 3)
x1 = -1 atau x2 = -3