Question

căn 2 nhân(x-1)+căn 8 = 0

Answer 1

\(\sqrt{2}.\left(x-1\right)+\sqrt{8}=0\)

<=> \(x\sqrt{2}-\sqrt{2}+\sqrt{8}=0\)

<=> \(x\sqrt{2}+\sqrt{2}=0\) 

<=> \(\sqrt{2}\left(x+1\right)=0\)

=> x = -1

Answer 2

\(\sqrt{2}\left(x-1\right)+\sqrt{8}=0\)

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

\(\Leftrightarrow x-1=-2\)

\(\Leftrightarrow x=-1\)