After the first transformation:
After the second transformation:
If the negative is outside the square root, you're changing the a parameter (vertical change). Both the solution guide and my answer has the negative inside the square root. In high school, I know that you can't have a negative numerical value in a square root but the letters (unknowns) can also be negative which could result in a positive value. But, I still need help understanding the minor difference in answers between me and my solutions guide.