Question

tìm x : √9( x-2)  =3

Answer 1

\(\sqrt{9\left(x-2\right)}=3\left(đk:x\ge2\right)\)

\(\Leftrightarrow3\sqrt{x-2}=3\)

\(\Leftrightarrow\sqrt{x-2}=1\)

\(\Leftrightarrow x-2=1\Leftrightarrow x=3\left(tm\right)\)

Answer 2

\(\sqrt{9}\left(x-2\right)=3\)

\(\Leftrightarrow3\left(x-2\right)=3\)

\(\Leftrightarrow x-2=1\)

\(\Leftrightarrow x=3\)