ĐK x >= -3/2
pt <=> \(x^2+4x+5+2x+3+1=2x+3+2\sqrt{2x+3}+1\)
\(x^2+6x+9=\left(\sqrt{2x+3}+1\right)^2\)
<=> \(\left(x+3\right)^2=\left(\sqrt{2x+3}+1\right)^2\)
=> \(x+3=\sqrt{2x+3}+1\)
=> \(x+2=\sqrt{2x+3}\)
=> \(x^2+4x+4=2x+3\)
=> \(x^2+2x+1=0\)
=> \(\left(x+1\right)^2=0\)
=> x +1 = 0
=> x = -1 (TM)
VẬy x = -1 là n* của pt