RE: why does (-5)*(-4)=20 ?, eom
October 13, 2013 at 3:26 am
(This post was last modified: October 13, 2013 at 3:26 am by bennyboy.)
I think Brakeman's approach makes sense. We have to understand what people mean when they have -X of something. Adding a negative sign is just a way of showing a loss.
So 4 * -5 means we have four groups of losses of $5.
-4 * -5 means we lose four groups of losses of $5.
So all you really need to understand is that a loss is a bad thing, so losing a loss is a good thing.
So 4 * -5 means we have four groups of losses of $5.
-4 * -5 means we lose four groups of losses of $5.
So all you really need to understand is that a loss is a bad thing, so losing a loss is a good thing.
