Question

giải nhanh giúp mình nha

Answer 1

DKXD: \(x\ge2\)

\(\Leftrightarrow\dfrac{2}{5}.5\sqrt{x-2}=6\\ \Leftrightarrow\sqrt{x-2}=6\\ \Leftrightarrow x-2=36\\ \Leftrightarrow x=38\)

Answer 2

   \(\dfrac{2}{5}\sqrt{25x-50}=6\)

⇔  \(\sqrt{25x-50}=15\)

⇔     \(25x-50=225\)

⇔             \(25x=275\)

⇔                \(x=11\)