What is the range of the function f(x) = 3x − 12 for the domain {-2, 2}?
{3, 12}
{-6, -18}
{-18, -6}
{6, 18}
{12, 3}

Question

What is the range of the function f(x) = 3x − 12 for the domain {-2, 2}?
{3, 12}
{-6, -18}
{-18, -6}
{6, 18}
{12, 3}

adamaero · Answer

The domain is the set of all first elements of ordered pairs (x-coordinates). The range is the set of all second elements of ordered pairs (y-coordinates). Domain and range can be seen clearly from a graph: http://www.mathsisfun.com/sets/images/range-domain-graph.gif

adamaero · Answer

adamaero · Answer

adamaero · Answer

I know the answer, and will tell you if you're right 
if you explain why you choose one of the answers. 
=)