Step-by-step explanation:
[tex]f(x) = {3x}^{2} - x \\ [/tex]
[tex]f( - 4)[/tex]
[tex]f( - 4) = 3( - 4) {}^{2} - ( - 4) \\ [/tex]
[tex]f( - 4) = 3 \times (16) + 4 \\ [/tex]
[tex]f( - 4) = 48 + 4 = 52[/tex]
