1.
rational numbers are numbers that can be written in form a/b where a and b are integers (-4,-3,-2,-1,0,1,2,3, etc) and b isn't 0
so for case
we need to make the denomenators the same
so for , multiply left one by d/d and multiply right one by b/b to get
therefore [/tex] is the rule
2. do the same as previous but do minus
so for case
we need to make the denomenators the same
so for , multiply left one by d/d and multiply right one by b/b to get
therefore [/tex] is the rule
3. not sure, I hope this is right
so for case
we need to make the denomenators the same
so for , multiply left one by d/d and multiply right one by b/b to get
if we multiply both sides by bd we get
ad+cb=0
therefore, ad=-cb for the sum to always equal 0
4.
multiply both sides by bd
ac=bd for the product of the 2 fractions to equal 1