Question

giải phương trình

\(\sqrt{9x+9}=20-\sqrt{x+1}\)

Answer 1

ĐKXĐ: \(x\ge-1\)

\(pt\Leftrightarrow3\sqrt{x+1}+\sqrt{x+1}=20\)

\(\Leftrightarrow4\sqrt{x+1}=20\Leftrightarrow\sqrt{x+1}=5\)

\(\Leftrightarrow x+1=25\Leftrightarrow x=24\left(tm\right)\)

Answer 2

\(\sqrt{9x+9}=20-\sqrt{x+1}\)

\(\Leftrightarrow x+1=25\)

hay x=24