Question 1130472
Maximum value, no.
Minimum value, yes.

Notice  {{{3x^2}}} term tells you something.


Completing the Square using  16:
{{{3(x^2+8x)-2}}}
{{{3(x^2+8x+16)-2-3*16}}}
{{{highlight(f(x)=3(x-4)^2-50)}}}


Vertex is a minimum, at  (4, -50).