The value of f(x)+g(x)= x²+ 3x - 1
a function from a set X to a set Y assigns to each element of X exactly one element of Y. The set X is called the domain of the function and the set Y is called the codomain of the function.
f(x) is the value of the function.
there is an x in the function f, it is replaced with the function g(x).
f(x)=3 x-2
g(x)=x²+1 .
(f+g)(x) = x²+1 + 3 x-2
f(x)+g(x)= x²+ 3x - 1
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