Hi - this is a Mom here trying to understand this so I can explain it to my kids, so any complete and EXPLICIT help would be greatly appreciated! I understand how to use the box method, and get everything correct when the coefficient is positive. However, when it becomes a negative, my answers are wrong everytime. I know that you factor out the negative 1 first, then do the box method. The question is, how do you know which set to multiply it back into?
For example: -x^2-3x+28. Please solve using box method.
Other example -m^2-13m-40
I get the answers correct, but my signage is always wrong on one of the groupings. Any help would be great!