Find f g and fg 5 fx 9 3xgx 5x 7 Solutionif fx 93x and g

Find f + g and f-g. 5. f(x) = 9 -3x;g(x) = 5x -7

Solution

if f(x) = 9-3x and g(x) = 5x -7 then....

f+g = 9 - 3x + 5x - 7

f+g= (-3x +5x) +9-7

f+g= 2x +2

Now...

f-g= 9-3x - (5x-7) then...

f-g = 9- 3x -5x + 7

f-g = (-3x-5x) +9+7

f-g= -8x + 16