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What number must you add to complete the square of x2 12x equals 9?
Wiki User
∙ 9y ago
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Wiki User
∙ 9y ago
Wiki User
∙ 12y agox2+12x + 9 = 0. we want the 9 to be a 36. so add 27 to both sides. then (x+6)2-27 = 0.
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