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Absolute value key

I'm trying to enter the equation y= -IxI +1, but I can't seem to put the absolute bars around the x only. Please Help

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You go to the math key and you go to the right were it sayd num and youll see abs( then you type in ur abs numbers u want then close it with )

Posted on Mar 04, 2009

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Just type -abs(X)+1.You can access abs by entering the catalog it's the first thing.

Posted on Feb 23, 2009

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1 Answer

How do i solve equations involving absolute value


You must consider two cases.
1st case: What is inside the absolute value symbols is supposed positive. Remove the absolute value symbols and proceed to solve.
2nd case: What is inside the absolute value symbols is supposed negative. Enclose the contents of the absolute value within parentheses, put a negative sign in front the left parenthesis, and proceed to solve.
Gather the solutions obtained in the two cases. Use a Union symbol for the solution set.

Oct 08, 2014 | Office Equipment & Supplies

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How do i put the equation x+4y=20 on my calculator?


You cannot. The TI-30XA is a simple calculator lacking any symbolic algebra or equation processing. However, if your task is "given a value for x, what is the value for y" for the equation you give, you can rearrange it a little:

mib8888_36.gif

Thus, if you want to determine the value of y for x = 16, key in 5 [-] 16 [÷] 4 [=] and get the result y = 1. To double check, substitute x and y in the original equation:
16 + 4 x 1 = 16 + 4 = 20.

Feb 12, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

How do I enter (simple step-by-step please) the quadratic equation into this model of calculator?? Thanks.


The TI-30XA does not offer any symbolic algebra or equation solving functions. You will need to do some work on paper. However, its not super difficult.

Solving quadratic equations (finding the roots) involve three steps:
  1. Simplify the equation and bring into the normalized form x² + px + q = 0.
  2. Determine the discriminant D = p² - 4q and check if there are two, one or no solutions at all.
  3. Calculate the root(s), if any.
Lets do (1) with an example, 3x - 2 = ( 6 + x ) / x.
mib8888_37.gif

You should exercise this simplification with different examples until you can do it in your sleep. The goal is to get a form x² + px + q = 0, where in the above example case, p = -1 and q = -2.

Now, use the memory places #0 and #1 to store p and q, as in:

-1 [STO] 0
-2 [STO] 1

Next, you should determine the discriminant D = p² - 4q of the equation using your TI-30XA calculator. Having put the two values into the memory comes in handy here:

[RCL] 0 [x²] [-] 4 [x] [RCL] 1 [=] [STO] 2

Note, we put D into memory place #2, we will need it again later.

Now check the displayed value D:
  • if D
  • if D = 0, there is exactly one solution: -p / 2. Key in [RCL] 0 [+=-] [÷] 2 [=] and the displayed value is the only solution to the quadratic equation.
  • if D > 0, there are exactly two solutions:
    mib8888_39.gif
    Key in [RCL] 0 [+=-] [+] [RCL] 2 [mib8888_40.gif] [=] [÷] 2 [=] to get the first root, and
    [RCL] 0 [+=-] [-] [RCL] 2 [mib8888_41.gif] [=] [÷] 2 [=] for the second root.
In the example, the discriminant turns out to be 9, which is greater than 0, so there are two different roots. Following the key sequences you should get the roots x1 = -1 and x2 = +2. You can double check by calculating
mib8888_42.gif
and you'll receive the original, normalized equation.

As an exercise for your understanding: you can save a few keystrokes by saving -p to memory #0 instead of p. Try to figure out why this helps.

Feb 11, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

How do I put an absolute value in the TI81


2nd [abs] (the (-) key). For example, to take the absolute value of -1.2, press
2nd [abs] (-) 1 . 2 ENTER

Jan 28, 2011 | Texas Instruments TI-81 Calculator

1 Answer

How to input cos x=0.75?


I assume that if you want to input the equation it is with the intent to solve it. If that be the case then what follows will help you input and solve any equation (linear, quadratic, trig, etc.)

Make sure the calculator angle unit is the same as your problem requires (degree, radian, grad). Here are some screen capture to help you. Change the equation to yours. 21c8779.jpg4b6c1ea.jpg
To enter the equation in screen above, use the right arrow.

e75d252.jpg
You have to enter an initial guess on line X=, a default value may be supplied by calculator: It depends on last value stored in X. Once a value is entered press the F6 key to SOLV
a5b0f3e.jpg
289818e.jpg
Press F1: Rept if you want to solve another equation.

Nov 13, 2010 | Casio FX-9860G Graphic Calculator

1 Answer

SOLVE LINEAR EQN IN FX 9860GII


Let us hope the site does not act starngely. Here are some screen capture to help you.
21c8779.jpg4b6c1ea.jpg
To enter the equation in screen above, use the right arrow.

e75d252.jpg
You have to enter an initial guess on line X=, a default value may be supplied by calculator: It depends on last value stored in X. Once a value is entered press the F6 key to SOLV
a5b0f3e.jpg
289818e.jpg
Press F1: Rept if you want to solve another equation.

Oct 08, 2010 | Casio FX-9860G Graphic Calculator

1 Answer

I do not know how to graph using absolute values on my casio fx-9750GII. Is absolute value even possible on this calculator because i cant find it anywhere on the keys or in menus (unless im not looking in...


Hey it is. Okay, so start with a equation: say, y = -(1 |x|). Now type y = -(1 , then press the [OPTN] button, next to the shift. Next press the [NUM] button or F5. The first menu button should be Abs or absolute value. When your done it should look like this. y = -(1 Abs (x)) then graph it.

Aug 18, 2010 | Casio FX9750GII Graphic Calculator

1 Answer

How do i use e key above in key


The number immediately following the e key is the power to which the value of e (2.718281828) is raised. Thus, e5 is equal to 148.4131591, the same as (2.718281828^5) If you press the e key without entering a number after it, an error results. Therefore, the only way to read your equation [500e^0.4] is to assume that e is first being raised to the power of 0.4, then multiplied by 500. To enter this on the Casio, press 5 0 0 [shift] [In] . 4
You will get 745.9123488
If the equation is intended to read (500 multiplied by e) then this value raised to the power of 0.4, that doesn't make sense, as e has no number following it.

Your second equation, 6.1e^0.014 would be entered 6 . 1 [shift] [In] . 0 1 4
This returns a value of 6.186006

You omit the 'power of' sign when you enter the equations.

Hope this helps.

Apr 06, 2009 | Casio FX-9750GPlus Calculator

1 Answer

Problem using graphing on my casio


This calculator has so many options you can change, that it is possible one of them has been altered. Try pressing the master reset button at the back to re-set the calculator. Note that you will lose all your programs and data, so first copy out anything important. Also, set the xmin and xmax parameters to a higher value. To plot a sign wave, try xmin=-720, xmax=720, step=1, ymin=-1, ymax=1, step=.1 The step value won't change the appearance of the graph, just make it more chunky or fine. Use the equation y=sin x. This should draw a sign wave showing 4 complete waves. PS when you enter the X in the equations, you are pressing the X,0,T button, the one under the alpha key, aren't you? If you enter X using the x alpha key, it won't work. Also, to plot y=, make sure you change the func type parameter in the Set Up menu to y=. Hope this helps.

Oct 11, 2008 | Casio FX-9750GPlus Calculator

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