We had our first big math test today in my alg 2 class. One of my problems was: Solve (x+4)(x-2)=7. They needed to distribute, get it equal to 0, factor, and then use Zero Product Property to get the two correct solutions of x=3 and x=-5. One kid just did x+4=7 so x=3 and x-2=7 so x=9. Coincidentally one of his 2 solutions is correct, but he just got lucky there. I was planning on taking off the full 5 points as his method doesn't work, and he was just lucky to get one correct answer. Would you give any credit for that at all? Or in general, do you ever give credit if they use a completely wrong method, but just get lucky?