The first time I tried this problem I made the mistake of not FOIL-ing the negative symbol into the binomial on the right, and that gave me a completely wrong answer. At first I didn’t know what I did wrong, but after talking to a friend about the problem and comparing his work to time, I saw where I made my simple mistake not FOIL-ing the symbol. And I made this mistake because I rush my work, so going forward I’m going to take my time and double check everything.