@galatisnik5. His error is in the factoring. He did the left side of the equation right, but on the right side, he only divided b^2 by b and a^2 by a. In order to factor the right side you need to divide b^2 and a^2 by both a and b. He should have ended up with ab[(b/a)-(a/b)].
@galatisnik5. His error is in the factoring. He did the left side of the equation right, but on the right side, he only divided b^2 by b and a^2 by a. In order to factor the right side you need to divide b^2 and a^2 by both a and b. He should have ended up with ab[(b/a)-(a/b)].