Step-by-step explanation:
Simply replace X with 3 etc...
f (x) = 4x + 7
f (3) = 4 (3) + 7
f (3) = 12 + 7
f (3) = 19
f (2x) = 4 (2x) + 7
f (2x) = 8x + 7
Answer:
For the first one after F(3), write 4x + 7
4x + 7 12 + 7 = 19
For the second one after F(2x) write 4x + 7
24 + 7 = 31
I believe the number after the f represents the x, so you put that into the original equation
