Graphing Quadratic Functions w/
Technology
1. To see the graph:
 Type equation into Y= (clear any other graphs and
make sure Stat Plots are turned Off)
 Hit Graph
 Change the window if needed using WINDOW
button (standard window if #6)
2. To find the vertex:
 Determine if the vertex is a maximum or
minimum
 Hit 2nd CALC – choose minimum or maximum depending on your
given equation.
 Follow directions from the calculator to find points to the left and
right of the VERTEX and the value will appear at the bottom of the
screen.
3. To find the x-intercepts- HINT: where the function is zero
(SOLUTIONS)
 Hit 2nd CALC – zero
 Follow the directions from the calculator to find point to the left and
right of ONE of the x-intercepts at a time!
 Repeat steps for the second x-intercept.
4. To find a point/value when given the x-input
*Way 1** Hit TRACE
** Type in the given x value and the ordered air (x, y) will appear
on the screen.
*Way 2** Hit 2nd CALC – value
Vertex
Xintercept
** Type in the given x value and the
ordered pair (x, y) will appear on the screen.
Try It Out! Find the vertex, x-intercept(s), and
given x value for each function.
a.) y = x2
b.) y = 4x2 – x + 7
c.) y = -x2 + 2x – 1
X=3
Vertex
Xintercept
X = -4
Vertex
Xintercept
X=7