Question about Casio Brand New-Fx-991es Plus - Scientific Calculator

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Surd answers on the fx-991ES plus

When I type in a question using roots my calculator does not leave the answer in surd format. E.g. when you type in 2 x root 5..... the calculator used to give me the answer 2root5 (surd format) then I'd press S>D to get the decimal answer. Now when i do calculations in an exam and it says leave the answer in surd format I wont be able to do it. I must of fiddled about with the settings and messed it up. I'm finding this really annoying, could someone help. Thanks.

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  • Hadi Ali Dec 01, 2012

    its okay i fixed it ---------- For those who want to know the solution its shift MODE --- then press 1 and then 1 again.

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How do i do square root on texas instrument ti-15


hi

if it a scientific calculator there should be a surd key ( look like a square root symbol, other way to get a square look for the "^" key that the exponent or power key do the follow type in the number be square rooted and press the "^" key and type "(1/2)" ( without the "" of course) and you will get the square root of your number. You can use the log and ln keys as well

type in your number you want square rooted and press the log or ln keys divide the result by 2 press the anti log key use might have press the 2nd key or shift key and press the log ( or 10^ key) or ln( or e^ key) the 10^ key and the e^ key change log to normal numbers

i.e.

square root 9

type 9 press log to get .954242509 for a result
divide by 2 to get .477121255 press the 10^ key to get
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The capability of these calculators to handle irrational numbers in radical form is limited to square roots. Roots of index other than 2 are always displayed in their decimal representation.
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1 Answer

Hi there, I have a Casio fx-991ES, and my calculator doesn't seem to be converting decimals in surd form... i.e. 0.3354101966 was the last number I typed in that didn't work... That, in surd...


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