find the zeroes of x^2-4x+5
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x²- 4x + 5 = 0
x² - 5x + 1x + 5 = 0
x(x - 5) + 1(x - 5) = 0
(x + 1) = 0 or (x - 5) = 0
x = - 1 or x = 5
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