i'm not entirely sure, but i think it'd be this:
f(x)= -2x-5 for x=3
f(3)= -2(3)-5 (substitute 3 for x, then solve -2 times 3)
= -6 -5 (add them up)
= -11 (yeah)
like i said, i'm not entirely sure, but you can check out this site: http://www.purplemath.com/modules/fcnnot.htm
good luck on your test!
- Just A Person
