The instructions are below the screen. It says Mode arrow and a table of numbers.
If you want to set (use) degrees, you press the MODE key followed by the 4 key. On the top of the screen deg will be displayed.
If you want to set RAD or GRAD, similarily, you press MODE followed by 5, or MODE then 6.
However if you want to convert a result displayed in a particular unit into other angle units, you press SHIFT MODE then 4 or 5 or 6, whichever is the case for you.
Hope it helps.
The answer does not applies to the FX-115ES, but to another calculator FX260 Solar.
For the FX115ES fractions anre converted to decimals by making use of the [S to D] key. If you want all results to display with decimals use [SHIFT] [MODE/SETUP] to select
[6:FIX] n where n is a number between 0 to 9 decimal digits; exemple 4 xxx xxx. dddd
[7:Sci] n where n is a number between 0 to 9 decimal digits ; exemple 4 x.dddd * 10^( ±dd)
[8:NORM] 1 or NORM 2 .
If you do not need fractions and radicals, you can set calculator Input/Output to LineIO, To do so press [SHIFT][MODE][2:LineIO], and all results will be in decimal format.
If you need to reset the default MathIO (with fractions and radicals), just press [SHIFT][MODE][1:MathIO].
When in MathIO, a result in fractions or radicals can be converted into decimal format by pressing the [S<->D] key.
Also when in MathIO, and you want a result to be displayed decimal format, instead of pressing =, press [SHIFT][=].
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SOURCE: how to have casio 115ES display answers as
To convert a single value, press the S<>D key. To have all answers appear as decimals, press 2nd MODE 2 to select LineIO mode.
SOURCE: Inputing factors on a casio fx-115es calculator
Unless I am failing to understand your problem, just combine like terms to get:
9x^2+2x+4 and then enter those coefficients into the quadratic solver.
That will get you the two answers -- both of them will be complex.
If you wanted to turn those two answers into factors (complex) of the original equation simply
change the signs on each and put an x in front.
Of course, the quadratic formula would also work.
CG
SOURCE: Convert to/from Decimal/Binary
Press MODE 4 to enter the BASE-N mode. If the display doesn't say Dec, press SHIFT DEC (the x^2 key) to set base 10. Enter the number to convert. Press SHIFT BIN (the log key) to switch to base 2.
Each time you switch the base the current value is redisplayed in that new base.
SOURCE: How do i convert fractions
To convert a single result to decimal, press the S--D key. To have all results come out in decimal, press SHIFT MODE 2 to select the LineIO mode.
SOURCE: how to change casio calculator into decimals,my
To convert a single result to decimal, press S--D. To have all results come out in decimal, press SHIFT MODE 2 to select the LineIO mode.
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