Question

Match each description when z = 9 + 3i. 1. Real part of z 2. Imaginary part of z 3. Complex conjugate of z 4. 3i - z 5. z - 9 6. 9 - z A. -9 B. 3i C. -3i D. 9 - 3i E. 3 F. 9 5x2 - 20 = 0 x3 - x2 + x - 1 = 0 x3 + 3x2 + x + 3 = 0 x3 - 2x2 + x - 2 = 0 x3 - 6x2 - 16x + 96 = 0

Answer 1

$1)\quad \Re(9+3i)=9\qquad\text{F}\\\\ 2)\quad \Im(9+3i)=3\qquad\text{E}\\\\ 3)\quad \overline{(9+3i)}=9-3i\qquad\text{D}\\\\ 4)\quad 3i-(9+3i)=3i-9-3i=-9\qquad\text{A}\\\\ 5)\quad 9+3i-9=3i\qquad\text{B}\\\\ 6)\quad 9-(9+3i)=9-9-3i=-3i\qquad\text{C}$