Question 124870
Yes, that is exactly what you were supposed to do


{{{f(x)=3x-2}}}
{{{f(8)=3(8)-2}}}
{{{f(8) = 22}}}


Just substitute the given value for x wherever it occurs.


if {{{f(x)=3x^2+4x-2}}}, then {{{f(8)=3(8)^2+4(8)-2}}}
{{{f(8) = 192+32-2=222}}}


Super-double-plus extra credit:  If {{{f(x)=3x-2}}}, what is {{{f(x-1)}}}?