OpenStudy (anonymous):
What is the difference between complex numbers...and quadratic equations
OpenStudy (anonymous):
A complex number is any number that can be represented as the sum of some number on the real number line and some number on the imaginary number line, a number line perpendicular to the real number line that contains multiples of sqrt(-1), which is more commonly denoted as i. Complex numbers find applications in AC electronics in calculating impedance. They are also used in producing fractal images, and they turn up in quantum mechanics as well. The real numbers are a subset of the complex numbers (specifically, they're complex numbers where the imaginary part happens to be zero). (quadratic equation) an equation in which the highest power of an unknown quantity is a square.
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