> -1 *-1 = 1 huh? > > Well, think of it like this: > > The minus (negative) signs cancel eachother out: > > (-1)(-1)= > > [(-)(-)](1x1)= > > So then, multiply the + and numbers: > > (+)(1x1)= > > You've got positive 1: > > +1 > > It's so simple.
It's simpler than what you wrote. The signs don't cancel. Indeed, this begs the question of how what exists (the two negative signs) can change to a state of not existing. Instead, the two negative signs combine to form a positive sign: - - becomes, after rotating one of the negative signs so that it is perpendicular to the other negative sign, +.