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That equation can not be factored. It can however be solved for x:
x2 - 9x + 4 = 0
x2 - 9x + 81/4 = 81/4 - 4
(x - 9/2)2 = 81/4 - 16/4
(x - 9/2)2 = 65/4
x - 9/2 = ± √65 / 2
x = (9 ± √65) / 2
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