If $-3+i x^2 y$ and $x^2+y+4 i$ are complex conjugates, then $\mathrm{x}=$

If $-3+i x^2 y$ and $x^2+y+4 i$ are complex conjugates, then $\mathrm{x}=$
  1. 0
  2. $\pm 1$
  3. $\pm 3$
  4. $\pm 4$

Solution

$\because-3+\mathrm{ix}^2 \mathrm{y}$ and $\left(\mathrm{x}^2+\mathrm{y}+4 \mathrm{i}\right)$ are complex conjugate. Then, $-3-i x^2 y=x^2+y+4 i$ Comparing both sides we get:- $ \begin{aligned} & x^2+y=-3 ......(i)\\ & -x^2 y=4.......(ii) \end{aligned} $ Solving eqs. (i) \& (ii), we get $ x= \pm 1 $

Asked in: AP EAMCET 2023 (18 May Shift 2)

Practice more Complex Number questions on Aicharya