It is risky to square both sides as it shall give erroneous root.
Let us first find the range of x
as we can take the square root of a non -ve number only so we
$x \ge -2$
for $x \in [-2,0] LHS is positve and RHS is -ve or zero. so this is range in -ve
To find the range is positive we square both sides to get
$(x+2) > x^2$
or $x^2-x-2 <0$
or $(x-2)(x+1) <0$ or $x \in [-1,2)$
as x is positive so $x \in [0,2)$
so combining we get $x \in [-2,2)$
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