Step-by-step explanation:
[tex] \bf \: given \: that \\ \bf \: f(x) = {x}^{3} - {4x}^{2} - 16x + 9 \\ \\ \tt {:}\longrightarrow f( - 4) = { - 4}^{3} - 4( - 4) {}^{2} - 16( - 4) + 9 \\ \tt {:}\longrightarrow - 64 - 4(16) + 64 + 9 \\ \tt {:}\longrightarrow - 64 + 9 \\ \tt {:}\longrightarrow - 55[/tex]