Question 120736
{{{f(x)= 2x + 4}}} Start with the given function



{{{f(a-4)= 2(a-4)+ 4}}} Plug in {{{x=a-4}}}



{{{f(a-4)= 2a-8+ 4}}} Distribute



{{{f(a-4)= 2a-4}}} Combine like terms