A) \[-20\]
B) \[-60\]
C) \[-120\]
D) 60
E) \[156\]
Correct Answer: C
Solution :
Given, \[{{(x+iy)}^{1/3}}=2+3i\] \[\Rightarrow \] \[x+iy={{(2+3i)}^{3}}\] \[\Rightarrow \] \[x+iy=-46+9i\] \[\Rightarrow \] \[x=-46,y=9\] \[\therefore \] \[3x+2y=3\times (-46)+2\times 9\] \[=-138+18=-120\]You need to login to perform this action.
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