Worksheets — Set 4

Algebra II · Honors · Complex numbers (intro)

Print and write your answers. Use diagrams to show thinking.

Warm-up

1. (8 + 2i) + (6 − 5i) = ___ 2. (7i)(−3i) = ___ 3. Plot 7 − 4i on the complex plane. ___

_See printable PDF for diagram._

Written practice

1. (7 + 2i) + (5 − 5i) = ___ 2. (6i)(−2i) = ___ 3. Plot 6 − 3i on the complex plane. ___ 4. Multiply: (5 + i)(5 − i) = ___ 5. Solve x² + 8 = 0 in ℂ: x = ___ 6. Real part ___ , imaginary part ___ 7. (10 + 2i) + (8 − 5i) = ___ 8. (9i)(−2i) = ___

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More written practice

1. Plot 9 − 4i on the complex plane. ___ 2. Multiply: (8 + i)(8 − i) = ___ 3. Solve x² + 11 = 0 in ℂ: x = ___ 4. (13 + 2i) + (11 − 5i) = ___ 5. (12i)(−2i) = ___ 6. Plot 12 − 3i on the complex plane. ___

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Patterns and rules

1. (24 + 2i) + (22 − 5i) = ___ 2. (23i)(−1i) = ___ 3. Plot 23 − 4i on the complex plane. ___

_See printable PDF for diagram._

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Parent tip: Combine like terms: real with real, imaginary with imaginary