Answer:
5f(- 12) = 115 , 2f(- 9) = - 40
Explanation:
given
f(x) = - x - 11
to evaluate f(- 12) , substitute x = - 12 into f(x)
f(- 12) = - 12 - 11 = - 23 , then
- 5f(- 12) = - 5 × - 23 = 115
similarly to evaluate f(- 9), substitute x = - 9 into f(x)
f(- 9) = - 9 - 11 = - 20 , then
2f(- 9) = 2 × - 20 = - 40