# How to take integral of absolute value(x) on a Casio fx-991ms

I don't know if this is the correct place for this question, if there is a more appropriate forum please let me know.

Trying to solve the probability density function which has an absolute value in it, how can I integrate an absolute value on a Casio fx-991ms calculator? In order to enter absolute value (x) I need to switch to Mode 2, but once I do that everything I entered for the integral disappears. If I try to do this in Mode 2 to begin with than the integral symbol simply does not work in Mode 2.

• You may be able to split the integral over the current interval to calculate the integral of the negative going and positive going parts of the original function, made absolute, separately. Once done you can sum up these parts manually by correcting signs as necessary. – James Arathoon Nov 27 '17 at 17:54

You could try taking the (non-negative) square-root of the square, since $$|x|=\sqrt{x^2}$$ for all real numbers