The problem
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why was the 2nd square root moved on the other side of the = sign? why wasn't it squared and brought down like the 1st square root
Answer provided by our tutors
We want to isolate the variable 'x' to solve (get rid of the square root). If you do as you suggest you will be stuck with
So, it is better to move one of the roots to the other side of the equation (this is a method of solving these type of equations):
