a: Ta có: \(\sqrt{x}=15\)
nên x=225
b: Ta có: \(2\sqrt{x}=14\)
nên x=49
c: Ta có: \(\sqrt{x}< \sqrt{2}\)
nên \(0\le x< 2\)
d: Ta có: \(\sqrt{2x}< 4\)
\(\Leftrightarrow2x< 16\)
hay \(0\le x< 8\)
a.
\(\sqrt{x}=15\Rightarrow x=15^2=225\)
b.
\(2\sqrt{x}=14\Rightarrow\sqrt{x}=7\Rightarrow x=7^2=49\)
c.
\(\sqrt{x}< \sqrt{2}\Rightarrow x< 2\Rightarrow0\le x< 2\)
d.
\(\sqrt{2x}< 4\Rightarrow2x< 16\Rightarrow x< 8\Rightarrow0\le x< 8\)