HP 48G Calculator

Please tell me how I can solve for X solely by putting this equation into the calculator.

2X +7 - = 0
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

If you go into the equation solver, you can type in your equation, and type in your variable to solve for, and the calculator will do it for you.

I think the equation solver is (green-arrow)+solve???  (I don't have my calculator with me)
There are 2 ways to do it:

1) Using the Equation Solver:

Enter it by using the green arrow + SOLVE [7]

Then select "Solve equation..."
On the Equation input box, type in the equation using single-quotes as the delimiter.
On the "X:" input box, press SOLVE [F]

The value of X will be returned.

2) By using Symbolic manipulation

using the stack (not screens are active), type-in the equation and press [ENTER]:

1:      '2*X+7=0'

now type in 'X':

2:      '2*X+7=0'
1:                 'X'

Now press the pink (left) arrow, and SYMBOLIC [9]

Press ISOL [C]

The result of X will be returned on the stack:

1:     'X=0.28571429'



Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Actually there are 2 more ways to do it.

One is by using a matrix (a vector, actually) and the other is by using the Solver but without any like on the step I first outlined in my answer.

Using matrices is more suitable when you have a linear system of more than one variable, like this:

2*X + 3*Y = 7
4*X -  9*Y = 18

Then you use the command RREF to evaluate the matrix above, which will give you the correct values for X, Y and any other variables you may have on the linear system.


A correction to my answer:

The result of X will be returned on the stack:

1:     'X=-3.5000000'

I wrote the wrong result because I had typed in the wrong equation (7X - 2=0)


Dixie103099Author Commented:
Thank you very much for your detailed answer.  I am getting the hang of the calculator now.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.