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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
81: 1,3,9,27,8165: 1,5,13,65GCF: 1
1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1
81 x 3 = 243
1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1 = 81