Complex Numbers

Numbers built from $i = - 1$ . Example: $(2 + i) (1 - i) = 3 - i$ .

5 lessons Â· 18 slides

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The number that squares to −1 — and complex number anatomy

2 slides

FOIL + 'i² = −1' — that's it

2 slides

Distance from origin + flipping the imaginary sign

3 slides

The most common complex-number mistake — getting the sign wrong

1 slides

Real CC BY 4.0 problems from OpenStax Precalculus 2e §3.1

10 slides