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 23 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=2x^2+4x+7 To do so, we will first make a table of values.

x 2x^2+4x+7 y=2x^2+4x+7
- 3 2( - 3)^2+4( - 3)+7 13
- 2 2( - 2)^2+4( - 2)+7 7
- 1 2( - 1)^2+4( - 1)+7 5
0 2( 0)^2+4( 0)+7 7
1 2( 1)^2+4( 1)+7 13

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 }