Chapter 4B (4.5-4.8) Practice Test

What is the simplified form of (-9 + 5i) + (3 -2i)

• -12 + 31i

• -6 + 3i

• -11 + 7i

• 5 - 3i

Simplify:
(2 - 3i)(5 + 4i)

• 22 - 7i
• 22 + 7i
• 22 - 7i²
• 22 + 7i²

• 10
• -10
• 10i
• -10i

Simplify:
√-108

• 3i√6
• 3i√20
• 6i√3
• 20i√3

Solve
3x² - 5 = -446

• ±√-147
• 7i√3
• ±7i√3
• -7√3

(4-5i)(4+5i)

• 41
• -9
• 41+40i
• -9+40i

Solve by completing the square:
k² − 12k + 23 = 0

• {6 + √13, 6 - √13}
• {-6 + √13, -6 - √13}
• {6 + √59, 6 - √59}
• {-6 + √59, -6 - √59}

Solve by completing the square.
 $x^2-6x-59=0$  

•  $x=\left\{\pm2\sqrt{17}+3\right\}$  

•  $x=\left\{\pm17\sqrt{2}+3\right\}$  

•  $x=\left\{\pm2\sqrt{17}-3\right\}$  

•  $x=\left\{\pm17\sqrt{2}-3\right\}$