Respuesta :

[tex]x^2\text{ }+\text{ 5x + 4}[/tex]Explanation:[tex](x+4)(x+1)[/tex]

Expanding:

[tex]\begin{gathered} x(x\text{ + 1) + 4 (x + 1)} \\ x^2\text{ + x + 4x + 4} \end{gathered}[/tex]

collect like terms:

[tex]\begin{gathered} x\text{ + 4x = 5x} \\ x^2\text{ }+\text{ 5x + 4} \end{gathered}[/tex]