Question 452709
1. I think you are correct.
2. I think your first choice is correct.
These seem to just want you to know the meaning of "plus or minus".
3. You are correct, 4 is the answer.
4. Look at what you did for #3. You took the coefficient of m and divided it by 2, and then squared it. (-4/2 = -2, and (-2)^2 = 4.) This comes from the fact that (a + b)^2 = a^2 + 2ab + b^2. So in this case, for #4, divide 12 by 2 (and get 6), and then square that (and get 36). So the answer is 36. The factored expression would be (a + 6)(a + 6).