Question about Texas Instruments TI-89 Calculator

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Algebra please, How can I solve this? expand((x-5)^3). I´d like to use the "x" variable but a message " Non algebric-variable in expxpression" is appear. Thanks

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For expand, you don't need to put ",x" at the end.

just do: expand( (x-5)^3 )
and you should get: x^3-15x^2+75x-125

Posted on May 21, 2008

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What is the average rate of change for 5x+4


The rate of change for the function y=5x+4 is the coefficient 5 that multiplies the independent variable x. For a unit variation of x (x varies by 1) y varies by 5 units.
Between x1=2 to x2=3, y varies from y1=5*2+4=14 to y2=5*3+4=19.
The rate of change is defined as
(variation in y)/(variation in x)=(19-14)/(3-2)=5

Sep 28, 2014 | SoftMath Algebrator - Algebra Homework...

1 Answer

5I+5(I-31)=55 how do i solve this


Start by using the distributive property to expand the term 5(I-31)=5*I-5*31=5*I-155.
Rewrite the equation as 5*I+5*I-155=55
Combine the terms with I, this yields 10*I-155=55
Add 155 to both sides of the equation 10*I-155+155=55+155
you now get 10*I=210
Divide both sides of the equation by 10
(10*I)/10=210/10
Cancel the 10's on the left and divide 210 by 10 to get 21
Thus I=21

Basically you use the priority order of operations BEDMAS backwards

Feb 13, 2013 | SoftMath Algebrator - Algebra Homework...

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Find the x- and y-intercepts and graph the equation plotting the intercepts. Please show all of your work. Submit your graph to the Dropbox.5x-4y=-10


Use the definitions of the intercepts.
x-intercepts (or zeros or roots) are the values of the independent variables that make the function equal to zero. To obtain an intercept set y=0 in equation : 5x=-10, mean x=-10/5=-2
y-intercept: value of y when x=0.
Just set x=0 in equaltion and solve for y
-4y=-10, gives y=5/2

And Sorry, I cannot enter the answer in the drop box.

May 10, 2012 | SoftMath Algebrator - Algebra Homework...

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How would i solve for an expression and be able to leave it in terms of the variable, like (2a-1)(8a-5) and get the answer with the variable in it


This calculator cannot manipulate algebraic expressions. You can enter an expression and generate a table of values. You can enter an equation in one unknown and solve it. But you cannot do algebra.
You would need a calculator that has a Computer Algebra System (Algebra FX 2.0, or ClassPad 300/330). Sorry.

May 10, 2012 | Casio FX-115ES Scientific Calculator

1 Answer

I just got the TI-Nspire. I'd like to solve a problem with undefined variables using Negative Exponent and things like the Expanded Power Rule. The Nspire will not let me store "x" as a variable. How...


You need the TINspire CAS (Computer Algebra System) to do symbolic manipulations. The Blue TINspire (with TI 84 keyboard) can only perform numerical computations.
If you use variables, the calculator will assign the numerical value stored in the variable.

Aug 17, 2010 | Texas Instruments TI-Nspire Graphic...

1 Answer

TI 89 when solving equations or integrating a message appears:


With the ALPHA keyboard, Type in the NewProb command and press ]ENTER] It resets the one-letter variables to their default status.
Alternatively, you can use the CATALOG of commands to launch the NewProb command.
Another way is
In HOME directory, press the [2nd][F1] to activate the F6 key. In the menu list, press 1:Clear a-z and ]ENTER].
If you have to use the variable x multiplied by a function (sin, cos, tan, log, etc) do not used implied multiplication: enter the [*] explicitly.

Apr 14, 2010 | Texas Instruments TI-89 Calculator

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Solve g(x)=-x


Simplifying
g(x) = -1x

Multiply g * x
gx = -1x

Solving
gx = -1x

Solving for variable 'g'.

Move all terms containing g to the left, all other terms to the right.

Divide each side by 'x'.
g = -1

Simplifying
g = -1

Jan 21, 2010 | SoftMath Algebrator - Algebra Homework...

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How to solve (4+x) (5-x)/(2+x) (7-x)=1


(4+x)(5-x)=(2+x)(7-x)
20-4x+5x-x^2=14-2x+7x-x^2
20+x=14+5x
20-14=4x
x=3/2:ans;

Oct 21, 2009 | SoftMath Algebrator - Algebra Homework...

1 Answer

1/(x+5) + 7/(22x+20) = (x+13)/(22x+20)


Multiply throughout by (x+5)(22x+20)
(22x+20)+7(x+5)=(x+13)(x+5)
29x+25=x²+18x+65
x²-11x+40=0
x=[11±?11²-4×1×40]/2
x=[11±?-39]/2

Jun 23, 2009 | SoftMath Algebrator - Algebra Homework...

2 Answers

Doesnt solve integrates and derivatives


try clearing the memory of all the variables..that might solve the problem mohit

Sep 23, 2007 | Texas Instruments TI-89 Calculator

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