alleryStart learning →In the complex number 7 + 4i, which part is the real part?
AThe number 4i
BThe number 7
CThe number 4
DThe number 11
Answer & Solution
Correct answer: B. The number 7
1. Standard form for a complex number is a + bi.
2. In that form a is the real part and bi is the imaginary part.
3. Matching 7 + 4i against a + bi gives a equal to 7, so the real part is 7.
_Source: OpenStax Precalculus (CC BY 4.0), section 3.1 Complex Numbers_
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