alleryStart learning →The equation x^2 + 4 = 0 has no real root. What are its complex roots?
A2 and -2
B4i and -4i
C2i and -2i
D4 and -4
Answer & Solution
Correct answer: C. 2i and -2i
x squared = -4 gives x = plus or minus 2i, since (2i) squared equals -4.
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