The formatting of this question is unclear. Is the original question supposed to read [tex]f(x)=3x^{2}-x[/tex] or [tex]f(x)=(3x)^{2}-x[/tex] assuming the former:
[tex]f(x)=3x^{2}-x[/tex]
[tex]f(-2)=3((-2)^{2})-(-2)[/tex]
[tex]f(-2)=3(4)+2[/tex]
[tex]f(-2)=12+2[/tex]
[tex]f(-2)=14[/tex]
