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 $\mathrm{x}=$
- 0
- $\pm 1$
- $\pm 3$
- $\pm 4$
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)
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