Saved Bookmarks
| 1. |
Find the value of \(\rm {15-30i}\over{3+4i}\)1. 3 + 6i2. 3 - 6i3. -3 + 6i4. -3 - 6i |
|
Answer» Correct Answer - Option 4 : -3 - 6i Calculation: z = \(\rm {15-30i}\over{3+4i}\) z = \(\rm {15-30i\over3+4i}\times {3-4i\over3-4i}\) z = \(\rm {45-150i+120i^2\over3^2-(4i)^2}\) z = \(\rm {-150i-75\over9+16}\) z = \(\rm {-75(2i+1)\over25}\) z = -3 - 6i |
|