Respuesta :
Answer:
a - a or (a +(-a))
Step-by-step explanation:
A negative plus a positive is always zero if they have the same variable.
					                   a+(-a) equals zero because they cancel each other out .
(a)(-a) equals -a
a/-a equals -a
and
a-(-a) equals positive a
					                
					             (a)(-a) equals -a
a/-a equals -a
and
a-(-a) equals positive a
 
			                   
					                  