Find f(2), this means that they want you to find f(x) when x = 2.
Since you know the value of x, substitute/plug it into the equation:
f(x) = 4x - 3 Plug in 2 into "x" since x = 2
f(2) = 4(2) - 3
f(2) = 8 - 3
f(2) = 5
