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 25 Page 100

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

Graph:

Domain: { all real numbers }
Range: { y | y≥ - 7 }

Practice makes perfect

We want to graph the given quadratic function. y=3x^2+12x+5 To do so, we will first make a table of values.

x 3x^2+12x+5 y=3x^2+12x+5
- 4 3( - 4)^2+12( - 4)+5 5
- 3 3( - 3)^2+12( - 3)+5 - 4
- 2 3( - 2)^2+12( - 2)+5 - 7
- 1 3( - 1)^2+12( - 1)+5 - 4
0 3( 0)^2+12( 0)+5 5

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 - 7. Using this information, we can write the domain and range of the function. Domain:& { all real numbers } Range:& { y | y≥ - 7 }