Worksheets — Set 13

Algebra II · Honors · Complex numbers (intro)

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

Warm-up

1. (17 + 2i) + (15 − 5i) = ___ 2. (16i)(−3i) = ___ 3. Plot 16 − 3i on the complex plane. ___

_See printable PDF for diagram._

Written practice

1. (16 + 2i) + (14 − 5i) = ___ 2. (15i)(−2i) = ___ 3. Plot 15 − 4i on the complex plane. ___ 4. Multiply: (14 + i)(14 − i) = ___ 5. Solve x² + 17 = 0 in ℂ: x = ___ 6. Real part ___ , imaginary part ___ 7. (19 + 2i) + (17 − 5i) = ___ 8. (18i)(−2i) = ___

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More written practice

1. Plot 18 − 3i on the complex plane. ___ 2. Multiply: (17 + i)(17 − i) = ___ 3. Solve x² + 20 = 0 in ℂ: x = ___ 4. (22 + 2i) + (20 − 5i) = ___ 5. (21i)(−2i) = ___ 6. Plot 21 − 4i on the complex plane. ___

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Patterns and rules

1. (33 + 2i) + (31 − 5i) = ___ 2. (32i)(−1i) = ___ 3. Plot 32 − 3i on the complex plane. ___

_See printable PDF for diagram._

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