1. Graphing Quadratic Functions
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Make a table of values and connect the obtained points with a parabola.
Graph:
Domain: All real numbers
Range: y≥ -12
We want to graph the given quadratic function.
y=x^2-6x-3
To do so, we will make a table of values.
| x | x^2-6x-3 | y=x^2-6x-3 |
|---|---|---|
| 0 | 0^2-6( 0)-3 | -3 |
| 1 | 1^2-6( 1)-3 | -8 |
| 3 | 3^2-6( 3)-3 | -12 |
| 5 | 5^2-6( 5)-3 | -8 |
| 6 | 6^2-6( 6)-3 | -3 |
Let's now plot the obtained points on the coordinate plane and connect them with a parabola.
We see above that the x-variable can take any value. Conversely, the y-variable only takes values greater than or equal to -12. Using this information, we can write the domain and range of the function.
Domain:& all real numbers
Range:& y≥ -12