
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).