Texas Instruments TI-89 Titanium User Manual page 749

2. Copy and paste the last answer to the
entry line and store it in the function
Move the cursor into the history
Note:
area to highlight the last answer and
press ¸, to copy it to the entry line.
3. Use the
abs( )
value of
f(x+yi)
(This calculation may take about 2
minutes.)
The absolute value of a function
Note:
forces any roots to visually just touch
rather than cross the
absolute value of a function of two
variables will force any roots to visually
just touch the
4. Copy and paste the last answer to the
entry line and store it in the function
.
z1(x,y)
The graph of
Note:
modulus surface.
Activities
function to find the absolute
.
axis. Likewise, the
x
plane.
xy
will be the
z1(x,y)
.
f(x)
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