Solution
Given the function
[tex]f(x)=3x^4+4x^3-12x^2+12[/tex]The graph of the function is shown below
The extreme points are
[tex]\begin{gathered} Minimum(-2,-20) \\ Maximum(0,\text{ 12\rparen} \\ Minimum(1,\text{ 7\rparen} \\ Global\text{ minimum \lparen-2, -20\rparen} \end{gathered}[/tex]