Question about M2K Garfield: It's All About Math Math (Ages 7-9) (GRF16AM201) for PC

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Use the problem solving strategy Guess and Check and Test to find two values of n that makes the equation 2n = n ^2 true.

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Not really what this site is for, but 0 and 2 fit the bill (hence the suggested strategy - algebra tends to discard the first solution).


Posted on Oct 07, 2008


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The equation for photosynthesis is?

In oxygenic photosynthesis water is the electron donor and, since its hydrolysis releases oxygen, the equation for this process is: 2n CO2 + 4n H2O + photons ? 2(CH2O)n + 2n O2 + 2n H2O. carbon dioxide + water + light energy ? carbohydrate + oxygen + water.

Dec 16, 2014 | Office Equipment & Supplies

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How can i write this in my calculator example. 2x=10 the answer is x=5 but how can i put x in the calculator

What you want to do is solve the linear equation 2x=10 to find the value of the unknown x that makes the equality true. Solving an equation usually involves rearranging therms, factors and so on. However your calculator was not designed to handle the solution of equations, no matter how simple they are.
Some Casio scientific calculators can solve some types of equations (polynomials of degree 2 or 3, simultaneous linear equations in up to 3 unknowns). These are the FX-115 ES (Plus) and FX-991 ES (Plus C). Other equivalent models are sold in the world under different names.

Oct 16, 2013 | Casio FX350MS Scientific Calculator

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How can i set up and solve n+2n-3000

If you call one n (as you did), the other is 2n-3000. The sum of the two is 91500. Thus
2n+n-3000=91500. Combine the terms with n to get 3n, Add 3000 to both sides (members) of the equation. Finally
3n=91500+3000=94500 . Divide both members by 3 to get
The other is 2n-3000=2(31500)-3000=60000.
Some calculators have a solver that you can use to solve linear and nonlinear equations, However, since you no not disclose the brand or model number, nobody will be able to tell you how to set it up. Sorry.

Jan 12, 2012 | Office Equipment & Supplies

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Three times the smalles of theree consecutive odd numbers decreased by 7 equals twice the largest one. find the numbers

The hardest part of a word problem is translating it into the equation or equations you need. This one needs just one equation.

Let N = the smallest number. Since they are consecutive, the next ones will be N+2 and N+4. (It doesn't matter that they are odd, just that each one is 2 greater than the one before.)

So, N = the smallest number and N+4 = the largest. Translate the problem (3 times the smallest, N, decreased by 7, equals twice the largest, N+4) into numbers:

3N - 7 = 2 (N+4)

Then it's simple to find N:

3N - 7 = 2N +8

3N - 2N = 8 + 7

N = 15

The three numbers then are 15, 17, 19. Check the answer by seeing if they fit the original problem. 3 X 15 = 45, 45 - 7 = 38, 2 X 19 = 38, so we got the right values.

Mar 06, 2011 | Office Equipment & Supplies

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I am trying to solve a quadratic function using the calculator but i dont seem to be able to do so. For example if i had a question like 5x^2 + 15x +3, how would i use the sharp el-w535 to find the x...

This expression 5x^2+15x+3 is not an equation, therefore it can have any value depending on the value of x. You have to make it an equation before looking for the particular value of x that satisfy your equation 5x^2+15x+3 =0

This calculator cannot solve equations because it does not have an equation solver.

Dec 15, 2010 | Sharp ELW535 Calculator

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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.

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
Press F1: Rept if you want to solve another equation.

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

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I need to solve this problem, can anyone help? 2.5/7 = x/10 How do I get this calculator to do it?

It looks like overkill to use the calculator to solve this first order linear equation but I will show you how to use the Solve function available on this calculator.

First solution: Pen and paper.

Use the properties of proportions:
Let a, b, c, and d numbers, with b, and d not equal to 0
if a/b=c/d then a*d=b*c
To apply it to your case, you set a=2.5, b=7, c=x, and d=10.
This gives 2.5*10=7*x
Dividing both members of the equation by 7 yields x=25/7.

Using the SOLVE program
  1. Calculator should be in computational mode: Press [MODE][1:COMP]
  2. Type in the equation in the way described below:
  3. You will need to use the key sequence [ALPHA][CALC] (=) to insert the = sign, the one at the top left, not the one at the bottom right.
  4. You will need to use the sequence [SHIFT][CALC] (SOLVE) to order the calculator to start solving your equation.
  5. You will need the key sequence [ALPHA] [)] to insert the X variable.
  6. Now that you have been alerted to the sequaences you will need, here is how to enter your equation.
  7. 2.5/7 [ALPHA][CALC] (=) [ALPHA] [ ) ] (X) /10
  8. While the above sequence is in the command line with the cursor still blinking to the right of the 0, press [SHIFT][CALC] to access the (SOLVE) command.
  9. The calculator displays in the top line of the dispaly "Solve for X". At the bottom there would be some old (irrelevant value).
  10. At this point you are expected to enter a value for your initial guess.
  11. You can for example enter 2 and press [=] at the bottom right. If you do not type a guess, the calculator uses the old (irrelevant) value as initial guess.
  12. So you enter initial guess 2 and press the [=/EXE] key at the bottom.
  13. After a while (could be short , if the initial guess is inspired) the calculator returns with the solution.
  14. The solution display screen recalls your equation on the top line,
  15. X=3.571428571 on the middle line, and
  16. L-R= 0 on the bottom line.
The L-R=0, tells you that the difference between the LEFT side and the RIGHT side of your equation is 0. That means the X given in the second line is the solution within the tolerance of the calculator.

If you are not happy with the solution (L-R different from 0), or the calculator failed to return a solution, you can press [SHIFT][CALC] (SOLVE) to restart with a better guess.

Feb 10, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How to program quadratic equation

I have no idea what you mean by program in this context. So I am going to assume you want to solve, because that is what one is supposed to do with an equation.

Suppose you have the quadratic equation a*X^2+b*X+c=0, where a, b, and c are constants. Specify your own constants if you want to use this calculator.

  1. Define a function Y1= a*X^2+b*X+c
  2. Graph it if you want.
  3. Use the solve( command to find the roots of the equation (the zeros of the function)
To access the solve (
  • Press [2nd][0] to open the (CATALOG) of commnands
  • Press [LN] (S) to jump to the first command in the CATALOG that starts with S.
  • From there, scroll down till you point to solve(
  • Press [ENTER]
  • Commnd echoes on main calculator screen as solve( with blinking cursor. You must enter the function Y1 you defined before.
  • Press [VARS], and right arrow to highlight [Y-Vars]
  • Select [1:Function] then [1:Y1]
  • Y1 echoes on main screen, which displays solve (Y1
  • Complete the command by entering a comma, X, a comma, initial guess and ) parentheses.
  • The screen dispays solve ( Y1, X, value_of_initial_guess)
  • Press [ENTER]
  • If your guess is good, you will not wait long to have one solution.
  • To obtain the second one, press [2nd][ENTRY] to recall the last command to the command line solve ( Y1, X, value_of_initial_guess).
  • Use the arrow to modify the value of the initial guess, make sure the ) is still there and press [ENTER].
  • If the guess is good you will get the second solution.
Here is an exemple. Y1 is just X^2+X-14. For the negative root I took the initial guess to be -3, and for the positive root the guess is 2.

How did I get such good guesses? Usually it is trial and error, but I cheated: I drew the function to have an idea about the values of X where the function vanishes.


If that is not what you wanted, post a comment in this thread and we will take it from there. If it did not help you, I am sure it will help others.

Jan 30, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

-5(n-2)=4(2n+3) put in ti 89 how?

To enter this equation on a TI89Titanium is rather trivial: You use the keyboard and the [ALPHA] key to enter the variable (or unknown) n.
The question I am asking you is this: "What do you intend to do with the equation once it is entered?"

As you can see on the screen capture I am enclosing, if you just want to enter it and if n does contain a value already, all the calculator will do is to echo the command without modification. Obviously this is not what you want.

The screen capture shows you two other commands you can use solve( and expand (.

That should answer your question concerning how to enter the equation (look at the command line) and maybe help you decide what you want to do with the equation once it is entered.

Jan 25, 2010 | Texas Instruments TI-84 Plus Calculator

2 Answers

How do you enter the equation 4(5x+3)=2(7x+6) in the calculator?
Refer to page 12 of the manual under Inputting expressions and values. It is pretty straight forward if you need further assistance please let me know.
Thank you,

Nov 17, 2009 | Casio FX-115ES Scientific Calculator

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