Unknown (math) facts
In mathematics, an unknown is a number we do not know. In algebra, an unknown is represented by a letter. For example, in the equation E = m c^{2}, the letter m represents an unknown mass, and the letter E represents an unknown amount of energy. Not all letters in algebra represent unknowns. In the example above, c represents a known quantity, the speed of light, which is about 186 thousand miles per second. Because c is so large, the formula E = m c^{2} tells a person who understands algebra that in an atomic reaction, a small amount of mass can produce a very large amount of energy.
Images

A conic section is the intersection of a plane and a cone of revolution.

A strange attractor which arises when solving a certain differential equation.
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Unknown (math) Facts for Kids. Kiddle Encyclopedia.