Question

If f(x) = 2x + 9, then f(-1) = _____.

Answer 1

F(-1)= 7

It’s equal 7 because
You substitute (-1) for (x)

Now the work is f(-1)= 2(-1) + 9

2*-1 is -2 then you add -2 with 9 and you get 7 Which is your answer

Hope I helped

Answer 2

Answer: 7

Step-by-step explanation:

f(x)=  2x  + 9

f(x) = 2 x -1 + 9

2 x -1= -2

-2 + 9 = 7