Well, first of all, you can only use it nested within another function that
will take that range and return a single value (like SUM()) because you can't
return an array into a single cell in Excel. Assuming that is what you want
to do, nest the ABS() function and commit it by pressing CTRL+SHIFT+ENTER.
For example:
=SUM(ABS(A1:A50)) (entered with CTRL+SHIFT+ENTER) will sum the absolute
values of A1 to A50.
You can select a column of 50 cells and array enter =ABS(A1:A50) to
simultaneously populate the entire selection, but it is not clear what
advantage that would have over a cell at a time.
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