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OpenStudy (anonymous):
x^2 + 4= 0 Solve in complex number system and find solution set. Please explain, thanks (:
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OpenStudy (anonymous):
Quadratic formula will work, but you can also look at it like a difference-of-squares except the + 4 becomes - (-4) and the square root of -4 is ±2i.
OpenStudy (anonymous):
Oh! Alright, that's what I was thinking but I wasn't sure if it was right. Thanks!
OpenStudy (anonymous):
You're welcome!
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