Sharp EL-9900 - Manual (Page 49)

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Chapter 3: Basic Calculations — Basic Keyboard
x Enters an “x”, an unknown variable. Use this key when working
with graph equations. Refer to Chapter 4 “Basic Graphing
Features” to learn how to use this feature.
To access the second function of a key (printed above the keys in
yellow), press and release @, then press the key you want to
use.
% Set the preceding value as a percentage.
Example
• Get 25% of 1234.
1 2 3 4 | 2 5 @
% E
* Percentage must be a positive
value equal to or less than
100.
x Enters “x - 1 ”, and returns an inverse by raising a value to the - 1
power. The inverse of “5”, for example, is “
1
5
”.
Example
• Raise 12 to the - 1 power. (= 0.083333333)
1 2 @ x E
Note: When no base number is entered, “x - 1 ” will be entered, with “x” left
blank.
C @ x ;1 2 E
_ Enters “ a ”.
Example
• Bring 4 to the 5 th root. (= 1.319507911)
5 @ _ 4 E
Note: When no depth of power is entered, “ a ” is entered, with both
number areas left blank.
C @ _ 5 ' 4 E
+ Enters a square root symbol.
Example
• Obtain the square root of 64. (= 8)
@ + 6 4 E
Second
functions