[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the concept of Functions.
Here, we are given with,
f(x) = 4x + 4 and g(x) = 5x - 8
hence, now we have time get (f-g) (x)
so we get as,
==> (f-g) (x) ==> f(x) - g(x)
===> 4x + 4 - (5x - 8)
==> 4x + 4 -5x +8
==> -x + 12
==> hence, 12 - x
so we get as,
(f-g) (x) ==> 12 - x
