A real number is a complex number of the form a + bi s.t. b = 0. That is, i, the square root of -1, is not a part of any real number.

Polynomials roots that appear at y = 0 on a graph are real numbers. Most numbers you use everyday are real.

by 1338 h4x0r April 1, 2008

by Chris M. April 5, 2004