Adding, Subtracting, & Multiplying Complex Numbers (Grades 11-12)

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Adding, Subtracting, & Multiplying Complex Numbers

1. 
Add. [math](3-9i) + 4i[/math]
  1. [math]7-9i[/math]
  2. [math]3+13i[/math]
  3. [math]3-5i[/math]
  4. [math]3-13i[/math]
2. 
Evaluate. [math]3i + (-4+2i)[/math]
  1. [math]-4+5i[/math]
  2. [math]4+5i[/math]
  3. [math]-4+i[/math]
  4. [math]4+i[/math]
3. 
Add the complex numbers. [math](-3+7i) + (3 - i)[/math]
  1. [math]6i[/math]
  2. [math]6 + 8i[/math]
  3. [math]-6 + 6i[/math]
  4. [math]6 + 6i[/math]
4. 
Subtract. [math](8 + 4i) - 6i[/math]
  1. [math]8 + 2i[/math]
  2. [math]8 - 2i[/math]
  3. [math]-8-2i[/math]
  4. [math]8 + 10i[/math]
5. 
Subtract the complex numbers. [math]3i - (-5 + 3i)[/math]
  1. [math]5[/math]
  2. [math]-5 - 6i[/math]
  3. [math]5 + 6i[/math]
  4. [math]-5[/math]
6. 
Evaluate. [math](5 - 6i) - (-3 + 9i)[/math]
  1. [math]2 + 3i[/math]
  2. [math]2 - 3i[/math]
  3. [math]8 - 15i[/math]
  4. [math]8 + 3i[/math]
7. 
Find the product. [math]4i(2 - 8i)[/math]
  1. [math]4i[/math]
  2. [math]0[/math]
  3. [math]-32 + 8i[/math]
  4. [math]32 + 8i[/math]
  5. [math]-4i[/math]
8. 
Expand and simplify. [math](10-12i)(10+12i)[/math]
  1. [math]100-144i[/math]
  2. [math]244[/math]
  3. [math]244i^2[/math]
  4. [math]244i[/math]
9. 
Evaluate fully.
[math](8-3i)(3+2i)[/math]
  1. [math]30-7i[/math]
  2. [math]18-25i[/math]
  3. [math]-6i^2+7i+24[/math]
  4. [math]30+7i[/math]
10. 
Multiply the complex numbers. Leave in the form [math]a+bi[/math].

[math](8 - 2i) (3i)[/math]
  1. [math]24 - 6i[/math]
  2. [math]-6 + 24i[/math]
  3. [math]6 + 24i[/math]
  4. [math]24 + 6i[/math]

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