/ ___ \ |1 + \/ x | lim |----------| x->4+| ___| \-1 + \/ x /
Limit((1 + sqrt(x))/(-1 + sqrt(x)), x, 4)
3
= 3.0
/ ___ \ |1 + \/ x | lim |----------| x->4-| ___| \-1 + \/ x /
3.0