a. Use a graphing utility to graph y = 2 x 2 − 82 x + 720 in a standard viewing rectangle. What do you observe? b. Find the coordinates of vertex for the given quadratic function. c. The answer to part (b) is ( 205 , − 120.5 ) . Because the leading coefficient, 2, of the given Function is positive, the vertex is a minimum point on the graph. Use this fact to help Find a viewing rectangle that will give a relatively complete picture of the parabola. With an axis of symmetry at x = 20.5 . the setting for x should extend past this, so try X min = 0 and X min = 30 . The selling for y should include (and probably go below) the y-coordinate of the graph's minimum y -value. so try Y min = 130 . Experiment with Y max until your utility shows the parabola's major features. d. In general, explain how knowing the coordinates of a parabola's vertex can help determine a reasonable viewing rectangle on a graphing utility for obtaining a complete picture of the parabola.
a. Use a graphing utility to graph y = 2 x 2 − 82 x + 720 in a standard viewing rectangle. What do you observe? b. Find the coordinates of vertex for the given quadratic function. c. The answer to part (b) is ( 205 , − 120.5 ) . Because the leading coefficient, 2, of the given Function is positive, the vertex is a minimum point on the graph. Use this fact to help Find a viewing rectangle that will give a relatively complete picture of the parabola. With an axis of symmetry at x = 20.5 . the setting for x should extend past this, so try X min = 0 and X min = 30 . The selling for y should include (and probably go below) the y-coordinate of the graph's minimum y -value. so try Y min = 130 . Experiment with Y max until your utility shows the parabola's major features. d. In general, explain how knowing the coordinates of a parabola's vertex can help determine a reasonable viewing rectangle on a graphing utility for obtaining a complete picture of the parabola.
Solution Summary: The author explains how to graph the function y = 2x2-82x+720 using a graphing utility.
a. Use a graphing utility to graph
y
=
2
x
2
−
82
x
+
720
in a standard viewing rectangle. What do you observe?
b. Find the coordinates of vertex for the given quadratic function.
c. The answer to part (b) is
(
205
,
−
120.5
)
. Because the leading coefficient, 2, of the given Function is positive, the vertex is a minimum point on the graph. Use this fact to help Find a viewing rectangle that will give a relatively complete picture of the parabola. With an axis of symmetry at
x
=
20.5
. the setting for x should extend past this, so try
X
min
=
0
and
X
min
=
30
. The selling for y should include (and probably go below) the y-coordinate of the graph's minimum y-value. so try
Y
min
=
130
. Experiment with Y max until your utility shows the parabola's major features.
d. In general, explain how knowing the coordinates of a parabola's vertex can help determine a reasonable viewing rectangle on a graphing utility for obtaining a complete picture of the parabola.
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