Quote:
Originally Posted by '|'empest
i brought 1 over to the left, -1 = i^2
i was looking for a much harder answer than they're after apparently...
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i^2 + 10b i + 4a = 0
i = ( -10b ± sqrt(100b^2 - 16a) ) / 2
i = -5b ± sqrt(25b^2 - 4a)
equating real parts: b = 0
square both sides: -4a = -1
a = 1/4