See also the Dr. Math FAQ: Browse High School Imaginary/Complex
Numbers Stars indicate particularly interesting answers or good
places to begin browsing. Selected answers to common questions:
Imaginary numbers in real life. - Simplifying and Working with
Imaginary Numbers [04/11/2008] What is the rule for simplifying
an expression like sqrt(50)/sqrt(-5)? Do you get i*sqrt(10) or
-i*sqrt(10)? Is there a general rule for simplifying imaginary
square roots with regard to handling the i? - Simplifying
Complex Numbers [05/23/2003] Can you explain why the Product
Rule doesn't apply to the problem sqrt(-49) x sqrt(-16) ? - The
Sin(z) Mapping [10/13/1998] If z is a complex number, show that
the function z to sin(z) maps the line y = 1 into an ellipse.
What does the line x = 1 map to? - Sketch a Graph [6/1/1996]
z=(3-2i)^1/2, then find z^. - Solving Complex Variables
Equations [09/01/1998] Determine all z such that: 2z +
(conjugate of z)^2 = -1+6i ... - Solving Quadratics with
Imaginary Roots [05/28/1998] Different wa