Question

                   giúp mình với ạ

Answer 1

\(\Rightarrow\left(x+4\right)^2=0\\ \Rightarrow x+4=0\Rightarrow x=-4\)

Answer 2

\(x^2+8x+16=0\)

\(\Rightarrow\left(x+4\right)^2=0\Rightarrow x=-4\)