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Posted on Jan 02, 2017
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.
Posted on Apr 28, 2009
SOURCE: m mod n in Casio fx991MS
there is one button ab/c beneath CALC... if u want to calculate 7 mod 4 then... u should press 7 then ab/c 4 and equal to
1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...
Posted on Jun 29, 2009
To convert fractions to decimals or decimals to fractions, you use the [S<->D] key. Each time you press the key the result is displayed in the other format.
Alternatively, If you multiply or divide two integer numbers put a decimal mark at the end of one of the numbers (any one). The result will be displayed in decimal format.
Hope it helps.
Posted on Sep 12, 2009
Tips for a great answer:
Jun 18, 2018 | Casio Computers & Internet
Aug 04, 2012 | Casio Brand New-Fx-991es Plus - Scientific...
To change the exponential display format, press the [MODE] key 3 times.
Fixed number of decimal places:
Press 1: Scientific Notation: 0
Press 2: SCI: 0
Press 3: NORM
You will then be prompted for NORM 1 or NORM 2. CHOOSE NORM 1
To return the calculation mode and setup to the initial defaults, press [SHIFT] [CLR]  [=]. This will return the calculator to the following settings: Calculation mode COMP Angle unit Deg Exponential display format Norm 1 Fraction display format a b/c Decimal point character Dot Percentage Calculations
To return the calculation mode and setup to the initial defaults, press [SHIFT] [CLR] 
[=]. This will return the calculator to the following settings:
Calculation mode COMP
Angle unit Deg
Exponential display format Norm 1
Fraction display format a b/c
Decimal point character Dot
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