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# Algebra II Terms

## Get down with the lingo

### Base

The number an exponent is "attached" to (what a leech). For example, bn has a base of b.

### Coefficient

A number multiplied by a variable. In the term 23x, that'd be the number 23.

### Complex Number

Any number in the form a + bi where a and b are real numbers. In English, it's a number created by the addition of one real and one imaginary number.

### Domain

All the values x can take in a function. It's like x is a little king, and the domain is, well, its domain.

### Exponent

The number that indicates which power to raise the base to. In the term bn, the exponent is n.

### Horizontal Asymptote

A way to graphically describe the end behavior for a curve that approaches (and sometimes crosses) a certain outputted y-value.

### Imaginary Number

This is defined as the square root of -1.

### Index

Tiny Tim-sized number sitting in the radical √. For instance, 3 in the 3√.

### Irrational Number

This is a number that cannot be written as the quotient of two integers.

Also called a root, basically anything that uses √. It doesn't have anything to do with trees or plants, unless those plants are oddly mathematically inclined.

The expression or number inside a radical.

### Range

The set of all possible outputs (y-values) of the function.

### Rational Number

A number that can be written as the quotient of two integers. The denominator cannot be zero.

### Real Number

The set of numbers including both the rational and irrational numbers.