SOLUTION: how do i write this function to solve it f(x)=-3x+9 g(x)=8x+7 find f(g(x)) this is what i did but did not get the right answer: -3x+9(8x+7) i also tried it like this: (-3x+9)

Algebra ->  Functions -> SOLUTION: how do i write this function to solve it f(x)=-3x+9 g(x)=8x+7 find f(g(x)) this is what i did but did not get the right answer: -3x+9(8x+7) i also tried it like this: (-3x+9)      Log On


   

Question 304776: how do i write this function to solve it
f(x)=-3x+9
g(x)=8x+7
find f(g(x))
this is what i did but did not get the right answer: -3x+9(8x+7) i also tried it like this: (-3x+9)(8x+7)
Found 3 solutions by nerdybill, TX911, richwmiller:
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)=-3x+9
g(x)=8x+7
find f(g(x))
.
f(x)=-3x+9
f(g(x))= f(8x+7)=-3(8x+7)+9
f(g(x))=-24x-21+9
f(g(x))=-24x-12

Answer by TX911(36) About Me  (Show Source):
You can put this solution on YOUR website!
you would write it as:
-3(8x+7)+9
-24x-21+9
-24x-12
Remember, for a composite function where f(g(x)), you simply compose the functions by substituting g(x) in anywhere you see an x in the "f" function.
f(x) is -3x+9 and g(x) is 8x+7. So again, for f(x): -3(insert g(x) here) +9 and then simplify.
Hope this helps

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)=-3x+9
g(x)=8x+7
find f(g(x))
f(g(x))=8(-3x+9)+7
find f(g(x))