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A student writes the conjugate of 3 plus 4i. She keeps the real part and changes the sign of the:
AImaginary part
BIntegral part
CInterval part
DInverted part
Answer & Solution
Correct answer: A. Imaginary part
1. Conjugating leaves the real number untouched.
2. Only the term carrying i is flipped.
3. So the sign of the imaginary part changes, giving 3 minus 4i.
_Source: OpenStax Precalculus 2e, Chapter 3, Polynomial and Rational Functions._
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