RE: why does (-5)*(-4)=20 ?, eom
October 12, 2013 at 9:10 am
(This post was last modified: October 12, 2013 at 9:19 am by Anomalocaris.)
-5*0=0
-5*(-4+4)=0
(-5*-4)+(-5*4)=0
(-5*-4)+-20=0
(-5*-4)=20 Q.E.D.
No need to inject -1*-x=x before deriving -y*-x=yx
-5*(-4+4)=0
(-5*-4)+(-5*4)=0
(-5*-4)+-20=0
(-5*-4)=20 Q.E.D.
No need to inject -1*-x=x before deriving -y*-x=yx