Chapter 17: Activities
298
To save keystrokes, you can scroll up to find an expression you entered, copy it, and then edit it for
a new calculation.
Displaying Complex Results
Now solve the equation 2x
2
N
6x + 5 = 0. When you set
a+b
i
complex number mode, the TI-84
Plus displays complex results.
2. Press
Í
to convert the result to a
decimal.
3. Press
}
to highlight
and
then press
Í
to paste it to the entry
line.
4. Press
|
until the cursor is on the
+
sign
in the formula. Press
¹
to edit the
quadratic-formula expression to become
.
5. Press
Í
to find the other solution for
the quadratic equation
2x
2
N
11x + 14 = 0.
1. Press
z † † † † † †
(6 times),
and then press
~
to highlight
a+b
i
. Press
Í
to select
a+b
i
complex-number
mode.
2. Press
y 5
to return to the home
screen, and then press
‘
to clear it.
