2.4 Vocabulary for the Quadratic Inequalities |
|
Inputs that make a function output 0 or undefined. Used as endpoints on a sign chart. |
|
Factor A factor is a number, variable or quantity that is being multiplied. |
|
Two factors: Three factors: |
Two factors: 2 (x+1) Two factors: (x-3)(x2 + 2x + 1) |
|
Inequality |
An algebraic statement that a quantity is greater than or less than another quantity. Symbols used are |
. |
|
Interval |
A set consisting of all the numbers in between a pair of given numbers; a line segment representing such a set; a portion of the real number line. |
|
Irrational number |
A real number that is not rational. As a decimal, an irrational number is non-terminating and non-repeating. Some common irrational numbers are . Click here to review all subsets of real numbers. |
In a polynomial, the coefficient of the term with the highest degree. |
|
|
|
x-intercept |
The x-coordinate of a point where a graph intersects the x-axis. Since the point is on the x-axis, the y-coordinate is zero. |
|
A number that can be written in the form , where a and b are integers and . As a decimal, rational numbers either terminate (end) or repeat. Click here to review all subsets of real numbers. |
|
Revenue |
The amount of money generated from the sale of goods or services. |
|
An organizational tool used to keep track of the sign (positive or negative) of the function outputs in certain intervals. Normally, the endpoints of the intervals are the critical numbers of the function. |
|
Test number |
A number arbitrarily chosen in an interval to test whether the outputs in the interval are positive or negative. |
|
An input value for the function which has 0 for the output. In conventional usage, it’s a value for x which gives 0 as the y-value (output). For example the numbers 2 and -2 are zeros of the function because . On the graph of a function, a zero is an x-intercept. |
|
|
|