find the function value.
f(x) = -3x-4; f(0) and f(-2)

Question

find the function value.
f(x) = -3x-4; f(0) and f(-2)

anonymous · Answer

Substitute and evaluate.  For x=0$$f(x) = -3x-4\implies f(0) = -3(0)-4=-4$$You should be able to do the same thing for the other part of the problem.

anonymous · Answer

so would i go f(0) - f(-2)=2
so my answer would be  -4,2

anonymous · Answer

How are you computing this?  That isn't quite what I get.  f(0) is the value of the function (y value) when x=0.  We put zero into the function in place of x and do the arithmetic to find it.  To find f(-2) (which is the y value of the function at x=-2), we do the same thing, that is, we substitute in -2 for x and do arithmetic.  By my estimate$$f(x) = -3x-4\implies f(-2) = -3(-2)-4=6-4=2$$If we substitute these results into your equation that you introduced just above$$f(0) - f(-2)=-4-2=-6$$

anonymous · Answer

i don't get this at all

anonymous · Answer

I just did 0 minus -2= 2 and then I just took your -4

anonymous · Answer

I think you are sort of wandering in the dark.  Do you understand the concept of function notation?

anonymous · Answer

Some good stuff about functions and function notation..... http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut30_function.htm