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98 TI-30XS MultiView: A Guide For Teachers © 2006 TEXAS INSTRUMENTS INCORPORATED

Find the vertex of the parabola

y

=

x

(36 -

x

) using a table of values.

Reminder: The vertex of the parabola

is a point on the line of symmetry of

the parabola. Notice that (0, 0) and

(36, 0) are

x

-intercepts and the

parabola is open (concave) down. The

vertex will be between

x

=0 and

x

=36.

Notice that the vertex must be

between

x

= 16 and

x

= 20 since the

y

-values are the same. The

y

-values

must be increasing and decreasing

for

x

=16 to

x

=20.

Press Display

ozD

36 U z

E <

0

$ 4 $

< $

<

$ $ $

$

$

Using auto

o