My second question is also with adding rational expressions. the question is (x+1) divided by (x+3)(x-3) + 4(x-3) divided by (x-3)(x+3) + (x-1)(x-3) divided by (3-x)(x+3). I tried to take the last part times negative one. which still makes half of the denominator unequal. SO then i tried to make the denominator (x-3)(x-3)(x+3). i did this and i got 5x-11(x-1) divided by (x+3)(x-3). the back of the book gives a different answer and i am not sure where i am going wrong.