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≥ -8
x | 2x^2+4x-6 | y=2x^2+4x-6 |
---|---|---|
-3 | 2( -3)^2+4( -3)-6 | 0 |
-2 | 2( -2)^2+4( -2)-6 | -6 |
-1 | 2( -1)^2+4( -1)-6 | -8 |
0 | 2( 0)^2+4( 0)-6 | -6 |
1 | 2( 1)^2+4( 1)-6 | 0 |
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 -8. Using this information, we can write the domain and range of the function.
Domain:& all real numbers Range:& y≥ -8