Answer:
[tex](f.g)( - r + 5) = 162 - 27r[/tex]
Step-by-step explanation:
Greetings!!!
Firstly, from the given values of f(x) & g(x) find (f.g)
[tex](f.g) = ( - 3 - 3x).( - 9) \\ - 3. - 9 = 27 \\ - 3x. - 9 = 27x[/tex]
Thus,
[tex](f.g) = 27 + 27x[/tex]
and to find (f.g)(-r+5) substitute (-r+5) on the value of x. so, we will do like
[tex](f.g)( - r + 5) = 27 + 27( - r + 5) \\ = 27 - 27r + 135[/tex]
add like terms
[tex](f.g)( - r + 5) = 162 - 27r[/tex]
Hope it helps!!!
