x² + x - 20 = 0
x² - 4x + 5x - 20 = 0
x(x - 4) + 5(x - 4) = 0
(x - 4) (x + 5) = 0
x - 4 = 0 atau x + 5 = 0
x - 4 = 0
x = 4
x = 4 atau x = -5
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x² + x - 20 = 0
x² - 4x + 5x - 20 = 0
x(x - 4) + 5(x - 4) = 0
(x - 4) (x + 5) = 0
x - 4 = 0 atau x + 5 = 0
x - 4 = 0
x = 4
x = 4 atau x = -5