Verified answer

Let r = √x, then the expression is

r + 3 < r - 1 + r - 2

r + 3 < 2r - 3

r + 6 < 2r

6 < r

In other words, √x > 6, hence x > 36

OR, did you mean

√(x + 3) < √(x - 1) + √(x - 2) ?

Different question ! In which case, you must learn to state the question properly