Question

\(\sqrt{4x+20}-5\sqrt{x+5}+\dfrac{4}{3}\sqrt{9x+45}=2\)

Answer 1

ĐKXĐ: \(x\ge-5\)

\(pt\Leftrightarrow2\sqrt{x+5}-5\sqrt{x+5}+4\sqrt{x+5}=2\)

\(\Leftrightarrow\sqrt{x+5}=2\Leftrightarrow x+5=4\Leftrightarrow x=-1\left(tm\right)\)