RE: why does (-5)*(-4)=20 ?, eom
October 12, 2013 at 8:50 am
(This post was last modified: October 12, 2013 at 8:51 am by Chas.)
(October 12, 2013 at 8:26 am)Tiberius Wrote: Chas, you didn't really help out there, mainly because you perform the calculation -1 * -20 = 20, which is just another version of the problem OP was running into (two negative numbers multiplied becoming a positive number).
That is, in fact, the proof using the rules of arithmetic that the product of two negative numbers is positive.
I didn't 'perform' the operation - I derived the operation.
It makes it completely clear. It is arithmetic, not metaphysics.
Skepticism is not a position; it is an approach to claims.
Science is not a subject, but a method.
Science is not a subject, but a method.
