`\text{~~Holi~~}`
`1. \sqrt{2x+3} - 2\sqrt{x+1} = -1`
`-> \sqrt{2x+3} = -1+ 2\sqrt{x+1}`
`-> 2x+3=4(x+1)-4\sqrt{x+1} +1`
`-> 2x+3=4x+4-4\sqrt{x+1}+1`
`-> 2x+3=4x+5-4\sqrt{x+1}`
`-> 4\sqrt{x+1}=4x+5-2x-3`
`-> 4\sqrt{x+1}=2x+2`
`-> 2\sqrt{x+1}=x+1`
`-> 4(x+1)=x^2+2x+1`
`-> 4(x+1)=(x+1)^2`
`-> 4(x+1)-(x+1)^2=0`
`-> (x+1)(4-x-1)=0`
`-> (x+1)(3-x)=0`
`->` \(\left[ \begin{array}{l}x+1=0\\3-x=0\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=-1 (kđ)\\x=3(đ)\end{array} \right.\)
`\text{H mik có chút việc bận nên tí nx mik lm tiếp nhé}`
