# Composition and Inverse. Relations and Functions.

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Lesson's Glossary

Composite function: Combination of 2 functions where the input of the second is the output of the first.

Composition Suppose two functions f and g, where the range of g is a subset of the domain of f. Then the composition of f of g is f[g(x)].

Factoring: The process to brake a polynomial down into the product of several factors.

Factors: All whole numbers that are multiplied together to yield another number.

Factored Form: Any polynomial that is written as the product of polynomials of lower degree that may be obtained from the original polynomial.

Function: A relation of the type that has exactly one value in the domain (independent variable) matching a value in the range (dependent variable).

Function notation: A function written with the symbol f(x) instead of y. It is read as f of x.

Identity function: A function for which the input is equal to the output. In other words a function where x-coordinate is equal to the y-coordinate for all the domain of the function.

Inverse functions: Two functions are inverses if and only if both of their compositions result in the identity function. f[g(x)]=x and g[f(x)]=x.

Relation A set of ordered pairs.

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