√x=7;
x = 7^2
x=49
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V49=7
x²=144; / :V
x= +/- 12
x²=11; / :V
x = +/- V11
-----------------------
(V11) ^2 = 11
√3x-7=6;
V3x = 6+7
V3x = 13
x = 13/V3
x=13V3 /9
√3x²+1=8.
V3x^2 = 8-1
V3x^2 = 7
x^2 = 7/ V3
x^2 = 7V3/9 / :v
x = +/- V2V3 /3
... в последнем не уверенна....