If f (x) x+12 and g (x) - 2x, what is the value of (f - g) (144) ?

First, we want to subtract function f minus function g to get a new function:

(f-g) (x) = x+12 - (-2x)

(f-g) (x) = x+12+2x

(f-g) (x) = 3x+12

Now, we want to plug in 144 for x:

(f-g) (144) = (3) (144) + 12

(f-g) (144) = 432 + 12

(f-g) (144) = 444

Therefore, the answer is 444