A) \[\frac{15}{2}-10i\]
B) \[\frac{-15}{2}+10i\]
C) \[\frac{-15}{2}-10i\]
D) None of these
Correct Answer: B
Solution :
\[3-4i\] i.e., \[(3,-4)\]lie in fourth quadrant in complex plane, after turned anticlockwise through \[{{180}^{o}}\] this will lie in II quadrant, therefore, the number will be \[-3+4i\], now after stretching it 2.5 times i.e., multiplying by 2.5, the required complex number will be \[\frac{-15}{2}+10i\].
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