Index: (There are more FAQs on pages 1 and 2.
Those FAQs usually give more detail and many are more advanced that those on
this page. Under the TI FAQs heading, click "More Detailed Page 1" or
"More Detailed Page 2" in the navigation panel to go there.)
Index:
(1) How can I make the display brighter on a TI-82/83 series calculator?
(2) How do I enter an "x' in an equation on a TI-82/83 series calculator?
(3) How do I raise "x" to a power on my TI-82/83 series calculator?
(4) How do I change from degrees to radians on a TI-83 Plus?
(5) Can the TI-83 Plus use a split screen to display two different methods
such as TABLE and GRAPH?
(6) Can you do financial functions on the TI-82/83 series of calculators?
(7) Do the TI-82/83 Plus calculators do complex numbers?
(8) My TI-83 Plus won't work right. What can I do?
(9) I keep getting the wrong answers when I do exponents. How do I
know when to use parentheses?
(10) I often have trouble when I enter complex fractions for graphing.
Any ideas?
(11) How do I find the solution to an equation with one independent
variable? (This is also known as
finding the roots or x-axis
intercepts.
Answers:
1) How can I make the display brighter on a TI-82/83 series
calculator?
Press 2nd; then press the "up" arrow to increase brightness or press the
"down" arrow to decrease brightness.
----------------------------
2) How do I enter an "x' in an equation on a TI-82/83 series
calculator?
At the place where you want to enter "x," press the key with the [X,T,0,n]
label.
_________________
3) How do I raise "x" to a power on my TI-82/83 series
calculator?
You can enter any exponent after a variable by first pressing the caret
symbol, this ^; then entering the exponent you want. For fractional
exponents, enclose the whole fraction in parentheses. As a special case,
to get the "2" for x^{2}, press the let labeled x^{2}.
______________
4) How do I change from degrees to radians on a TI-83 Plus?
Press the mode key and select and highlight radians. To leave that
screen, press 2nd, [QUIT].
________________
5) Can the TI-83 Plus use a split screen to display two different
methods such as TABLE and GRAPH?
Yes, press the MODE button and highlight G-T. If you then graph,
you'll have both a graph and a table displayed on the screen.
_________________
6) Can you do financial functions on the TI-82/83 series of
calculators?
The TI-83 Plus can do financial functions. Press APPS and select
Finance.
___________________
7) Do the TI-82/83 Plus calculators do complex numbers?
The TI-83 Plus does, but the TI-82 does not. To set the TI-83 Plus for
complex numbers, press MODE and select "a+bi" instead of REAL.
__________________
8) My TI-83 Plus won't work right. What can I do?
I suggest you try to find a friend who knows a lot about calculators. If
you can't find anyone to solve the problem, and you must solve it, you can reset the memory to
the factory default settings. I suggest you do this very carefully. Here's how to do it:
1) Press 2nd, MEM, 7. The "Archive All" menu will be displayed.
2) Select "2: Default", and press enter. When the "Reset RAM" menu
appears, select "2:Reset" and press ENTER.
Be careful not to select 1:ALL RAM. This can delete your APPS and
programs.
____________________
9) I keep getting the wrong answers when I do exponents. How do I
know when to use parentheses?
A good rule of thumb is to always use parentheses if there's an
arithmetic operation in the exponent.
Examples: In 3^(1/2), the operation in the exponent is divide; for e^(2*4),
the operation is multiply;
x^(4-2), etc.
That includes operations such as 16^(3/4), and implied operations such as
3^(2x), which is probably more often used in graphing.
The applicable rule here is the order of operations: PEMDAS. In the
expression 16^3/4, the order or operations says raise 16 to the third power and
multiply the result by 4. Whereas, in 16^(3/4), both 3 and 4 are
exponents. Bottom Line: If you want something different
from the order of operations, use parentheses to tell the calculator exactly
what you want.
_______________________
10) I often have trouble when I enter complex fractions for graphing.
Any ideas?
I suggest you read item #9 above for the basic idea behind using
parentheses. A good rule of thumb is the same as the one for exponents in item #9 above:
If the denominator contains a math operation, then enclose the entire
denominator in parentheses. Examples: 2x/(3x+4); 2x/(x-1);
2/(3*4); and others of similar structure.
Notice that 2x + 3/3x is different from (2x+3)/3x, and that's different from
(2x+3)/(3x). In the last example, since I wanted the "x" in the term "3x"
to be in the denominator, I had to force it into the denominator by grouping
with parentheses. For these subtle reasons, I always tell students, when in
doubt, use parentheses. Of course, in an expression such as y = 2x + 3,
there's no need to enclose 2x in parentheses.
________________________
(11) How do I find the solution to an equation with one independent
variable? (This is also known as finding the roots or x-axis intercepts.
a) Enter the function and graph it.
b) Press 2^{nd}, CALC.
c) Press 2 to select root from the
menu.
d) Move the cursor to the left of the intercept and press ENTER.
e) Move the cursor to the right of the intercept and press
ENTER.
f) Move the cursor to the point
where you guess the intercept is and press ENTER again.
(NOTE: locating the
exact point is not at all critical. Just anywhere between the upper and
lower
bounds.)
g) The root wilI appear at the bottom of the screen.
Revised: 11/10/04