For this case we have a function of the form [tex]y = f (x)[/tex], where[tex]f (x) = x ^ 2 + x[/tex]
We must find the value of the function when x = 3, that is, f (3).
So:
[tex]f (3) = (3) ^ 2 + 3\\f (3) = 9 + 3\\f (3) = 12[/tex]
The value of the function when x = 3,is given by [tex]y = 12[/tex]
Answer:
[tex]f (3) = 12[/tex]
