A difference of the form -4−6\text{-}4-6-4−6 can be rewritten by factoring out the negative. When doing so, the signs of all terms change. -4−6=-(4+6) \text{-}4-6=\text{-}(4+6) -4−6=-(4+6) This is the same rule as when distributing a negative, but used the other way around.