Question

Answer 1

\(\sqrt{x-1}+\sqrt{4}\sqrt{x-1}+\sqrt{9}\sqrt{x-1}=12\)
\(\Rightarrow1\sqrt{x-1}+2\sqrt{x-1}+3\sqrt{x-1}=12\)
\(\Rightarrow\left(1+2+3\right)\sqrt{x-1}=12\)
\(\Rightarrow6\sqrt{x-1}=12\)
\(\Rightarrow\sqrt{x-1}=2\)
\(\Rightarrow\sqrt{x-1}=\sqrt{4}\)
\(\Rightarrow x-1=4\)
\(\Rightarrow x=5\)

Answer 2

=>6*căn x-1=12

=>căn x-1=2

=>x-1=4

=>x=5

Answer 3

=>6*căn x-1=12

=>căn x-1=2

=>x-1=4

=>x=5