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x² - 5x = 8
(x - 5/2)² - 25/4 = 8
(x - 5/2)² = 8 + 25/4
(x - 5/2)² = 32/4 + 25/4
(x - 5/2)² = 57/4
x - 5/2 = + √57/4
x = + √57/4 + 5/2