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Home > A2C > Chapter 9 > Lesson 9.3.3 > Problem 9-171

9-171.

Treat this as a difference of squares.

Use the Quadratic Formula, then use those answers as factors.

Using complex numbers, this can be treated as a difference of squares.

x2 + 4 = x2 − (−4)

(x + 2i)(x − 2i)

See part (b).