How do I do absolute value expression? - Office Equipment & Supplies

'-7.25' = 7.25

When it is time for you to put an expression in absolute value, press the OPTN key, then F5/Num, then F1/Abs. Open parenthesis, input expression, then close parenthesis.
For fractions, use the key with the symbol a b/c.
A little friendly advice, please do invest some of your time reading the manual. Most Casio graphing calculators work the same way. What you learn on one, works on another.

You must consider two cases.
1st case: What is inside the absolute value symbols is supposed positive. Remove the absolute value symbols and proceed to solve.
2nd case: What is inside the absolute value symbols is supposed negative. Enclose the contents of the absolute value within parentheses, put a negative sign in front the left parenthesis, and proceed to solve.
Gather the solutions obtained in the two cases. Use a Union symbol for the solution set.

Absolute value of 271 is 271; of -21 is 21. What is the expression you are trying to solve?

In Run/Mat screen, press the sequence [OPTN][F6:>][F4:NUMB][F1:ABS]. This will enter the abs( function on the command line. Complete its arguments (the expression inside the absolute value) and close the right parenthesis, then press EXE.

If you want to graph the absolute value of a function, feed the function to the absolute value ie graph y= abs(f(x)). The calculator will take care of it. See screen captures where I draw the function y1=x^3-5x^2-3 and y2='x^3-5x^2-3'. On the first graph the function is represented and on the second the function and its absolute value.







The calculator knows how to calculate the absolute value of an expression. The name of the command is abs(

If you are looking for a key, there is none. However, you can still determine the absolute value easily.

1. If you have a single number and its positive, the absolute value is the number itself.
2. If you have a single number and it is negative, just drop the leading minus sign or negate it by pressing the change sign key (+ -).
3. If you are handling a complicated expression just calculate it. When you obtain the final result (a number) use rule 1 or 2 above.
   

This snippet will give you the absplute value of x:
x > 0 ? x : -x

Hello,
nDeriv( is valid only for real variables.
The syntax is as follows:
nDeriv ( expression, variable, value, epsilon)

expression: the function the derivative of which you want to calculate
variable: the name of the variable in the expression above (usually x)
value: the numerical value of the e x where you evaluate the derivative
epsilon: the numerical value of the tolerance. Default is 1x10^(-3). But you can change it to a smaller value to obtain a more precise result.

To use default value of epsilon
nDeriv ( expression, variable, value)

To use a different epsilon, ex 1x10^(-4)
nDeriv ( expression, variable, value, 0.0001)

nDeriv( A^3 , A, 5., 0.0001) should give you 75

Hope it helps.