Question

Let f(x) = 2x - 7 and g(x) = -6x - 3. Find f(x) + g(x) and state its domain
A. 8x – 10; all real numbers
B. –4x – 10; all real numbers
C. 8x – 4; all real numbers
D. –4x – 4; all real numbers

Answer 1

f(x) is 2x-7 and g(x) is -6x-3
To get f(x)+g(x) you would add them together.
You would need parentheses, so it would not be 2x+7+6x-3
f(x) and g(x) are separable functions
so it would now be (2x+7)+(-6x+3)
The domain is the interval in which x has a defined y value when you plug it in.