It used to display surd form, however after resetting it no longer does. I have a Casio fx-991ES Plus. For example (1/2)^(1/2) used to give a surd however now only gives the decimal approximation!
To convert a single answer from symbolic to decimal, press the S--D key (just above the DEL key). To have all answers come out in decimal format, press SHIFT MODE 2 to switch to the LineIO mode.
SOURCE: I have a Casio fx 991ES and I'd like to have my
Select the Math input/output mode by pressing SHIFT [SETUP] 1.
[SETUP] is the shifted function of the MODE key, located just right of the round cursor pad.
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