Posted by Betty on Friday, January 20, 2012 at 8:10pm.
√x+2 - x = 0
√x+2 = x
x+2 = x^2
x^2 - x - 2 = 0
(x-2)(x+1) = 0
check for validity
√(2+2) - 2 = 2-2 = 0 ok
√(-1+2) - (-1) = 1 - (-1) = 2 nope
Note that if you had taken the minus √, it would have been ok. But √4 does not mean ±2 - it's just 2.
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