M = 2 - square_root(u - 3)
u = (v - 2)^2 + 3
Prove that M = v.
Your use of the square root is incorrect. , NOT x.
So . Whether that is equal to v- 2 or 2- v depends upon whether or .
If you are not told whether v is larger than 2 or not, the best you can say is that
. That is either v (if ) or 4- v (if ).