functions and relations

Mathematics
Tutor: None Selected Time limit: 1 Day

What is f(-2) for f(x) =  ?
Sep 16th, 2014

Hey Alyssa, let me help you out.  

f(x) functions are representative of domains and ranges. The domain would be any legal (the question would tell you what would be a legal x value, like for example f(x) for a domain containing x>0. That means any number greater than or equal to 1) x value inside f(x) and the range would be whatever f(x) equals (your y values).

For what you have given above it seems that the domain and range are 1-to-1 mappings. Whatever x equals for f(x), y also equals. So when x= -2, f(-2) = -2.

I know it seems too easy. If the function was f(x) = 3x-2 then when x=-2..... f(-2) = 3(-2) - 2 = -8. In this instance whenever x =-2, y = -8. This is also an ordered pair if you had to plot the point. (-2,-8).

But yes for your question f(-2) = -2.


Did this help? If so could you please best my answer (choose my answer as the best answer)? Thanks Alyssa!

Sep 16th, 2014

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Sep 16th, 2014
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