Identify each number as real, complex, pure imaginary, or nonreal com-plex. (More than one of these descriptions will apply.) 0

Key Concepts

Real Numbers

Real numbers include all the numbers that can be found on the number line, encompassing both rational numbers (like integers and fractions) and irrational numbers (like √2 and π). They can be positive, negative, or zero, and they do not involve imaginary components.

Complex Numbers

Complex numbers are numbers that have a real part and an imaginary part, expressed in the form a + bi, where 'a' is the real part, 'b' is the coefficient of the imaginary unit 'i' (where i² = -1). They extend the concept of one-dimensional number lines to two dimensions, allowing for solutions to equations that have no real solutions.

Imaginary Numbers

Imaginary numbers are defined as multiples of the imaginary unit 'i', which is the square root of -1. A pure imaginary number has no real part and is expressed as bi, where b is a real number. For example, 3i is a pure imaginary number, while 0 can be considered both real and imaginary since it can be expressed as 0 + 0i.