a) \(\sqrt{x-5}=3\)
\(x-5=9\)
\(x=14\)
b) Vì \(\sqrt{x-10}\) ≥0
⇒không có x thỏa mãn
c) \(\sqrt{2x-1}=\sqrt{7}\)
\(2x-1=7\)
\(2x=8\)
\(x=4\)
Bài 3
a) \(\sqrt{x-5}=3\)
\(\Rightarrow x-5=9\)
\(\Rightarrow x=14\)
b) \(\sqrt{x-10}=-21\)
\(\Rightarrow x\in\varnothing\)
c) \(\sqrt{2x-1}=\sqrt{7}\)
\(\Rightarrow2x-1=7\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=4\)