Question

F(n)=2n+3
Find f(-10)

Answer 1

Greetings from Brasil...

Just replace the N of the function F(N) with the requested value - 10:

F(N) = 2N + 3

F(- 10) = 2 · (- 10) + 3 now N has been replaced by - 10

F(- 10) = - 20 + 3

F(- 10) = - 17