Question

Answer 1

\(\Leftrightarrow8\sqrt{x-1}-4\left(x-1\right)-14+7\sqrt{x-1}=5-4x\)

\(\Leftrightarrow15\sqrt{x-1}=5-4x+4x-4=1\)

=>x-1=1/225

hay x=226/225

Answer 2

đk x ≥ 1

\(8\sqrt{x-1}-14-4\left(x-1\right)+7\sqrt{x-1}-5+4x=0\\ 15\sqrt{x-1}-14-4x+4-5+4x=0\\ 15\sqrt{x-1}-15=0\\ 15\sqrt{x-1}=15\\ \sqrt{x-1}=1\\ \left(\sqrt{x-1}\right)^2=1\\ x-1=1\\ x=2\left(tho\text{a}nm\text{a}n\right)\)