To find (f+g)(1), we can start by rewriting it as:
[tex](f+g)(1)=f(1)+g(1)[/tex]The function f and g have a set of pairs. We are looking for the pairs that have the first number "1", we want the second number. In both, they are the last pair.
For f this is (1,-2), so:
[tex]f(1)=-2[/tex]For g this is (1,1), so:
[tex]g(1)=1[/tex]So, substituting into the first expression, we have:
[tex](f+g)(1)=f(1)+g(1)=-2+1=-1[/tex]