Question 423357
g(x) = 3x - 2
f(x) = 2x + 4
x = 12


g-f(x) = g(x) - f(x) = (3x-2) - (2x+4)


this becomes 3x - 2 - 2x - 4 which becomes x - 6


when x = 12, this becomes 12 - 6 = 6


an alternative way to solve this is to solve for x = 12 first and then do the f(x) - g(x) thing.


example:


your original problem:


g(x) = 3x - 2
f(x) = 2x + 4
x = 12


replace x with 12 in f(x) and g(x) to get:


g(12) = 3*12 - 2 = 36 - 2 = 34
f(x) = 2*12 + 4 = 24 + 4 = 28


g(12) - f(12) = 34 - 28 = 6