7. Special Functions
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Make a table of values. Notice that the graph of the absolute value function g(x) is a V-shaped graph.
Graph:
Domain: All real numbers.
Range: g(x)≥0
To graph the function, let's make a table of values first!
x | |-3x-5| | Simplify | g(x) |
---|---|---|---|
-4 | |-3( -4)-5| | |7| | 7 |
-3 | |-3( -3)-5| | |4| | 4 |
-2 | |-3( -2)-5| | |1| | 1 |
-5/3 | |-3( -5/3)-5| | |0| | 0 |
-1 | |-3( -1)-5| | |-2| | 2 |
0 | |-3( 0)-5| | |-5| | 5 |
The domain of an absolute value function will usually be all real numbers, unless specific restrictions have been imposed upon the function. Domain: -∞ < x < ∞ To find the range of an absolute value function, we need to think about where the vertex of the function is located. Because this type of function will always have the same basic V-shape, the y-value of the vertex is the minimum or maximum of the range. The minimum of the given function is 0 and then it will continue increasing indefinitely. Range: 0 ≤ g(x) < ∞