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x² - (7/15)x - (2/15) = 0
x² - (7/15)x = (2/15)
x² - (7/15)x + (7/30)² = (7/30)² + (2/15)
{x - (7/30)}² = (49/900) + (2/15)
{x - (7/30)}² = (169/900)
x - (7/30) = √(169/900)
x - (7/30) = 13 /30 atau x - (7/30) = - 13/30
x = (13/30) + (7/30) atau x = (7/30) - (13/30)
x = 20/30 = 2/3 atau x = - 6/30 = - 1/5