How do you simplify #(3+y)/(y^2-9) -( y-3)/(9-y^2)#?
1 Answer
Explanation:
In adding and subtracting fractions, we need to have a common denominator.
The denominators are almost the same, but the signs in the second fraction are the wrong way around. We therefore need to do a 'switch-round'.
Note:
Now we have the same denominator and can add the fractions.
An alternative method would be to factorise first:
We still need to do a switch round in the second fraction.
(The signs change in only ONE bracket)
Converting to a common denominator .