Question 867077
It sounds like you want to find f(x) when x = 3. In other words, evaluate f(3).



{{{f(x)=x^3+3x^2-12x+7}}}



{{{f(3)=(3)^3+3(3)^2-12(3)+7}}} Replace ALL copies of x with 3.



{{{f(3)=27+3(9)-12(3)+7}}}



{{{f(3)=27+27-36+7}}}



{{{f(3)=25}}}