The set of complex numbers with $b = 0$ (i.e., $z = a + 0i$) is:
AThe set of imaginary numbers
BThe set of real numbers
CThe empty set
DThe set $\{0\}$
Answer & Solution
Correct answer: B. The set of real numbers
$a + 0i = a$ is real. The reals are a subset of complex numbers.
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