I have a sharp EL-531X calculator and I don't know how to solve x^2-5x-8=0

SOURCE: I need to change the time on my Sharp EL-1750PIII calculator

You can access the .pdf manual for your particular calculator here:

http://www.sharpusa.com/files/cal_man_EL1750PIII.pdf

Page 1 for how to set date/time:

“RATE SET”: To set the date, time, and tax rate, set this switch at the “RATE SET” position.
Date:
• Enter in the order of month, day and year, then press to complete the entry.
• Use to separate month, day, and year.
• When is pressed, the number entered is evaluated and displayed as “date” if the
value is within the following range; “Error” is displayed otherwise, and the previously set
date is restored.
Month: 1 - 12; day: 1 - 31; Year: 2000 - 2099 (in 4 digits) or 00 - 99 (in 2 digits)
Time:
• Enter in the order of hour, minutes, then press to complete the entry.
(There is no entry available for the seconds value. The clock starts at zero second.)
• If the hour/minute digit is less than 10, it is not necessary to enter the first digit “0”.
• Use to separate hour and minute values.
• When is pressed, the number entered is evaluated and displayed as “time” if the
value is within the following range; “Error” is displayed otherwise, and the previously set
time is restored.
Hour: 0 - 23 (24-hour system for the hour entry), Minute: 0 - 59

SOURCE: Sharp EL-520R manual?

Hello,
Here is the link to all supported educational calculators. Download the one closet to your yours. I looked under commercial, and consumer and no 520 listed.

http://www.lifechangingbox.com/products/TypeManuals/0,1083,15,00.html

Hope it helps.

SOURCE: manual for calculator sharp el 573

My Sharp El-573 calculator is in scientific mode and nothing I do will put it back in regular arithmetic mode. Please tell me how to switch it back. Thanks for any help! Barbara

SOURCE: I want my Sharp EL-W535HT To factorise a number to a base and a power for example 256 to 2^8.I know the new Casio can do that but how do you do it on the sharp Calculator.Thanx I would really apprecia

I would be interested in knowing the model number of the Casio calculator that can do prime factorization. I know and own several Casios (scientific and graphing) calculators and I have not found one that does it. Some graphing calculators are able to perform the factorization with the help of an additional program.

SOURCE: Just got a SHARP EL-531X, it won't do simple calculations with scientific notation, It keep saying

To enter the power of 10 with exponent use the Exp key followed by the exponent. If the exponent is negative, you must use the negation key (-) not the - key (for subtraction).
When you press the Exp key you do not type in the 10.