Question 1014729
if g(x) = 4x - 4, then g(3) means to replace x with 3 and evaluate the expression.
you will get g(3) = 4*3 - 4 = 12 - 4 = 8.


if  h(x) = 2x + 5, then h(3) means to replace x with 3 and evaluate the expression.
you will get h(3) = 2*3 + 5 = 6 + 5 = 11.


g(3) + h(3) becomes 8 + 11 = 19.


you could also have combined them when they were still in variable form.


when g(x) = 4x - 4 and h(x) = 2x + 5, then g(x) + h(x) = (4x - 4) + (2x + 5).


remove parentheses to get g(x) + h(x) = 4x - 4 + 2x + 5.


combine like terms to get g(x) + h(x) = 6x + 1.


let's call g(x) + h(x) some other name, such as k(x).


you get k(x) = g(x) + h(x) = 6x + 1.


this results in k(x) = 6x + 1.


when k(x) = 6x + 1, then k(3) = 6*3 + 1 = 18 + 1 = 19.


you get the same solution whether you evaluate them first and then combine, or whether you combine them first and then evaluate.


your solution is that g(3) + h(3) = 19.