Exercises: Extend Polynomial Identities to Complex Numbers

Factor completely over the complex numbers. Verify by expanding when asked.

Grade 9·20 problems·~40 min·Common Core Math - HS Number and Quantity·standard·hsn-cn-c-8

Work through problems with immediate feedback

Warm-Up: Review What You Know

Compute $(x + 2i)(x - 2i)$ . Simplify using $i^2 = -1$ .

$x^2 - 4$

$x^2 + 4ix - 4$

$x^2 + 4$

$x^2 - 4i^2$