A complex number z satisfies the equation
z^2\:=3+4i.
Which of the following is true about z?
Taking into account that
"3+4i=4-1+4i=2^2+4i+i^2=(2+i)^2,"
we conclude that "z^2=(2+i)^2," and hence "z=\\pm (2+i)."
Answer: 2
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