Respuesta :

[tex] \longrightarrow f( \rm x) = (x - 4)(x + 4)[/tex]

[tex] \\ \\ [/tex]

[tex] \longrightarrow f( \rm x) = {(x)}^{2} - {(4)}^{2} [/tex]

[tex] \\ \\ [/tex]

[tex] \longrightarrow f( \rm x) = {x}^{2} - 16[/tex]

Formula used = (a + b) (a - b) = a² - b²