Step-by-step explanation:

a. f)(x) +g(x)

(3×+2) + (4x-3)

just simply add like terms

3x+4x+2-3

7x-1

b. f(g(x)) substitute g(x) in the x of f(x)

3(4x-3)+2

Then distributive property (distribute 3 to 4x and 3 to -3 and proceed to multiplication)

12x-9+2

12x-7