Worksheets — Set 15

Trigonometry · Honors · Polar coordinates and complex numbers (intro)

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

Warm-up

1. (19 + 2i) + (17 − 5i) = ___ 2. (18i)(−2i) = ___ 3. Plot 18 − 3i on the complex plane. ___

_See printable PDF for diagram._

Written practice

1. (18 + 2i) + (16 − 5i) = ___ 2. (17i)(−1i) = ___ 3. Plot 17 − 4i on the complex plane. ___ 4. Multiply: (16 + i)(16 − i) = ___ 5. Solve x² + 19 = 0 in ℂ: x = ___ 6. Real part ___ , imaginary part ___ 7. (21 + 2i) + (19 − 5i) = ___ 8. (20i)(−1i) = ___

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More written practice

1. Plot 20 − 3i on the complex plane. ___ 2. Multiply: (19 + i)(19 − i) = ___ 3. Solve x² + 22 = 0 in ℂ: x = ___ 4. (24 + 2i) + (22 − 5i) = ___ 5. (23i)(−1i) = ___ 6. Plot 23 − 4i on the complex plane. ___

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Patterns and rules

1. (35 + 2i) + (33 − 5i) = ___ 2. (34i)(−3i) = ___ 3. Plot 34 − 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