Question about Casio CFX-9850G Plus Calculator

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How do you graph an equation on the calculator? For example, my equation is y=-1.5x 2.

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All right, I will show you how to draw a simple function such as y=5*X 2. The method is the same reagrdless of the complexity of the function.

  1. Turn calculator ON. If you do not see several icons press [MENU].
  2. Use arrow to select the [GRAPH] application and press [EXE].
  3. In the entry screen, the line with Y1= is highlighted. If it is not, use arrow to highlight it.
  4. Press the right arrow, the highlighting disappears leaving you with Y1= and the blinking cursor.
  5. At the position of the cursor type 5 then press the [X, theta,T] key, under the [ALPHA]. On the screen appears 5X, complete your equation by typing [ ] 2
  6. Press [EXE] to store function.
  7. If you want to draw other functions, it is time to do so on that screen.
  8. When done, press [F6:Draw].
  9. If the screen does not show a lot of the function, you can use the arrow keys to pan (move the center of the graph. You can pan Up, Down, Left, or Right.
  10. You can also press [SHIFT][V-Window] to set the window limits.

Posted on Sep 23, 2010

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Posted on Jan 02, 2017

SOURCE: how to graph linear equation in two variables

5x+6y=3x+2

Posted on Oct 11, 2008

  • 7993 Answers

SOURCE: How do I graph an equation such as y= 5x + 2?

Hello,
Turn calculator ON. If you do not see several icons press [MENu].
Use arrow to select the [GRAPH] application and press [EXE].
In the entry screen, the line with Y1= is highlighted. If it is not, use arrow to highlight it.
Press the right arrow, the highlighting disappears leaving you with Y1= and the blinking cursor.
At the position of the cursor enter 5 [X, theta,T] key under the [ALPHA]. On the screen appears 5X, complete you equation +2.
Press [EXE] to store function.
If you want to draw other functions, it is time to do so on that screen.
When done press [F6:Draw}.
If the screen does not show a lot of the function, you can use the arrow keys to pan the graph.
You can also press [SHIFT][V-Window] to set the window limits.

Hope it helps.

Posted on Oct 11, 2009

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  • 7993 Answers

SOURCE: How do I solve a polynomial equation:

Hello,

Sorry, but what you wrote is not an equation but a polynomial expression. You want to solve the equation x^4+5x^3-3x^2-43x-60 =0.

The solve( command, can only be used with real numbers.
The solve( is available through the CATALOG : [2nd][CATALOG], scroll down till you reach the command. Highlight it and press [ENTER]. The command echodes on main screen as solve( .
You complete the command by entering the expression (not the equation), the name of the variable you solve for, the initial guess , and { lower limit, upper limit} between curly brackets, and the closing parenthesis.
Exemple:
solve (x^4+5x^3-3x^2-43x-60 , x,0 {-5,0} ) [ENTER]
should give you the negative root,
solve (x^4+5x^3-3x^2-43x-60 , x,0 {0,5} ) [ENTER]
should give you the positive root.

It is implied that the expression is 0, so you should not insert =0, otherwise you get an error. Here for the lower limit is -5 you must use the change sign symbol (-) under the 3 key, not the regular MINUS.

You may ask how I knew that there were two roots when the equation is a quartic? By first graphing it to have an idea about where the roots lie and how many there are. You should always do that to speed up the search.

There is another way to zoom in on the roots: by drawing the graph and using the tools accessible under the [2nd][CALC] menu, namely the option [2:Zero]
The resolution of the TI83/84 is not good enough for this function that grows too fast, but I am inserting a picture of the curve from another calculator with a much better resolution.

56ccf66.jpg

Hope it helps.


Posted on Oct 18, 2009

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See the screen capture for an example.

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9c210b2.jpg
1594e5e.jpg

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9c210b2.jpg
1594e5e.jpg

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