You are given the function f(x) with rule
[tex]f(x)=2x^2+4.[/tex]
If you want to find f(3), you have to substitute into the function rule the x-value 3 and then determine the f(x)-value:
[tex]f(3)=2\cdot 3^2+4,\\f(3)=2\cdot 9+4,\\f(3)=18+4,\\f(3)=22.[/tex]
Answer: correct choice is A
