Question about Casio FX-115ES Scientific Calculator

# What keys do i use to solve problems with variables in them on my fx-115 ES calculator

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Probably the most important key for this is the CALC key (just below the SHIFT key). For full details, please refer to the "Using CALC" section in the manual. If you've misplaced the manual, you can download it (and the Appendix) from http://support.casio.com/manualfile.php?rgn=1&cid=004001004

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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## Related Questions:

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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.

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You cannot use it to solve equations.
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Simplify your first equation by dividing all its terms by 3, then use elimination to carry out the solution by hand.

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You don't need to calculate it. Just press
3 . 0 0 9 x10^x (-) 6
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x10^x is on the bottom row, to the right of the decimal point key.
(-) is on the far left column, above the RCL key.

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### Math book for the fx-115-es

Hello,

Use your internet seach engine or go to the casio worldwide web site. A google search returned this link to the New-Zealand site.

http://casionz.co.nz/Site/Pronto/Files/user_manuals/FX-115ES%20991ES.PDF

Hope it helps

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