Write the quadratic function f(x) = x^2 + 8x + 3 in vertex form.

A)
f(x) = (x - 4)2 - 13


B)
f(x) = (x - 4)2 + 3


C)
f(x) = (x + 4)2 + 3


D)
f(x) = (x + 4)2 - 13