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Solve the quadratic equation by completing the square x2 plus 2x plus 5 equals 0?
Wiki User
∙ 13y ago
x2 + 2x + 5 = 0
x2 + 2x + 5 - 5 = 0 - 5
x2 + 2x = -5
x2 + 2x + (2/2)2 = -5 + (2/2)2
x2 + 2x + 12 = -5 + 1
(x + 1)2 = -4
sq. root of (x + 1)2 = sq. root of -4
|x + 1| = 2i
x + 1 = +&- 2i
x + 1 - 1 = -1 +&- 2i
x = -1 +&- 2i
Wiki User
∙ 13y ago
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