Question

If F(x) = 3x + 10x and g(x) = 5x - 3, find (f+g)(x)

Answer 1

(f+g)(x) represents the sum of the two functions f(x) and g(x).

Arrange these functions vertically and add up like terms:

   f(x) = 3x + 10
+g(x) = 5x - 3
-----------------------
(f+g)(x) = 8x + 7

Please note:  You've typed in "F(x) = 3x + 10x and g(x) = 5x - 3."
I doubt that F(x) actually equals 3x + 10x.  Please ensure that you have copied down the original problem correctly.  Come back once you've done that, so that we can finish this problem solution.