15) f(x) = 3x + 5g(x)=-4x + 3find f(x) + g(x)17) f(x) = 2x +4g(x)= x - 5find f(x) - g(x)how do u solve these equations?

15) f(x) + g(x)  = -x + 8

17) f(x) - g(x) = x + 9

Step-by-step explanation:

15)

f(x) = 3x + 5

g(x)= - 4x + 3

Find f(x) + g(x)

f(x) + g(x)  = 3x + 5  + ( - 4x + 3 )

f(x) + g(x)  = 3x + 5   - 4x + 3

f(x) + g(x)  = -x + 8

17)

f(x) = 2x +4

g(x)= x - 5

Find f(x) - g(x)

f(x) - g(x) = 2x +4  - (x - 5 )

f(x) - g(x) = 2x +4  - x +  5

f(x) - g(x) = x + 9

Hope this helps.

r3t40

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.