Question 90358
{{{f(x) = -5x-1}}}


{{{f(a-1) = -5(a-1)-1}}} Plug in x=a-1 (just replace every x with a-1)


{{{f(a-1) = -5a+5-1}}}  Distribute


{{{f(a-1) = -5a+4}}}  Combine like terms