\(\sqrt{2x+5}=11\Leftrightarrow2x+5=11^2\)
=> 2x + 5 = 121
=> 2x = 121 - 5 = 116
=> x = 58
\(\sqrt{2x+5}=11\)
\(\Leftrightarrow2x+5=11^2=121\)
\(\Leftrightarrow2x=121-5=116\)
\(\Leftrightarrow x=\frac{116}{2}=58\)
\(\sqrt{2x+5}\)=11
\(\Rightarrow\sqrt{2x+5}=\sqrt{11^2}\)
\(\Rightarrow2x+5=121\)
\(\Rightarrow2x=121-5\)
\(\Rightarrow2x=116\)
\(\Rightarrow x=58\)
chúc bn học tốt ! :)