Resposta :
[tex](x + 4) {}^{2} \\ \\ x {}^{2} + 2x \: . \: 4 + 4 {}^{2} \\ \\ \boxed{\boxed{\boxed{x {}^{2} + 8x + 16 }}} \\ [/tex]
[tex](x + 4) {}^{2} \\ \\ x {}^{2} + 2x \: . \: 4 + 4 {}^{2} \\ \\ \boxed{\boxed{\boxed{x {}^{2} + 8x + 16 }}} \\ [/tex]