McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
1. Graphing Quadratic Functions
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Exercise 26 Page 100

Make a table of values and connect the points with a parabola.

Graph:

Domain: { all real numbers }
Range: { y | y≥ - 5 }

Practice makes perfect

We want to graph the given quadratic function. y=3x^2-6x-2 To do so, we will first make a table of values.

x 3x^2-6x-2 y=3x^2-6x-2
- 1 3( - 1)^2-6( - 1)-2 7
0 3( 0)^2-6( 0)-2 - 2
1 3( 1)^2-6( 1)-2 - 5
2 3( 2)^2-6( 2)-2 - 2
3 3( 3)^2-6( 3)-2 7

Now, let's plot the obtained points and connect them with a parabola.

We can see above that the x-variable can take any value. Conversely, the y-variable only takes values greater than or equal to - 5. Using this information, we can write the domain and range of the function. Domain:& { all real numbers } Range:& { y | y≥ - 5 }