Greek mathematician Heron of Alexandria is credited with having first conceived of imaginary numbers about the time of Christ, but it was Rafael Bombelli who first described the rules for the use of complex numbers in th... More »

Imaginary numbers are typically simplified in the same way that expressions with the variable x are simplified, with the exception of the expression i^2, which has a value equal to -1. For example, the expression 2i + 8i... More »

To add two imaginary numbers together, add their real number components. To add (2i + 4i), combine the real components: two and four, which gives the answer 6i. To add (7i + 3i), calculate the sum of the real components,... More »

The golden ratio was first recorded and defined in written form around 300 B.C. by the Greek mathematician Euclid in his major work "Elements." It is believed that the ancient Greeks may have used the golden ratio to det... More »

According to the university of Toronto, there are a variety of uses for imaginary numbers in the real world, most notably in the fields of electrical engineering and measuring natural phenomena. An electromagnetic field,... More »

When adding numbers, the rules of significant figures dictate that the sum should be rounded to the same place as the least significant place of the number, with the least number of places after the decimal point. Signif... More »

The numbers in use in the United States and everywhere around the world are part of the decimal system of numbers. It is a base 10 system, and the units are all powers of 10. More »