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X= - 13, 1

x2 + 12x - 13 = 0, add 13 to both sides

x2 + 12x = 13, add 62 to both sides to complete the square

x2 + 12x + 62 = 49

(x + 6)2 = 49, take the square root to both sides

x + 6 = ± √49, subtract 6 to both sides

x = -6 ± 7

x = -6 + 7 = 1 or x = -6 - 7 = -13

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Q: What is x when x to the second power plus 12x-13 equals 0?
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