### Home > CALC > Chapter 1 > Lesson 1.3.1 > Problem 1-102

1-102.

What values of *x* would make *f*(*x*) undefined or imaginary?

When *x*² + 4 = 0.

*D* = (−∞, ∞)

What values of *x* would make *f*(*x*) undefined or imaginary?

When *x*² + *x* = 0 and when *x* + 2 < 0.