Max rewrote the function f(x) = 42² +162+8 in vertex form by completing the square. He concluded that the vertex is (-2, 4), which was incorrect. Consider Max's work, listed below. In which step did Max make a mistake?

Step 1:f(x)= 42² +16+8 Step 2:f(2)=4(2²+4) +8

Step 3: f(a) 4(2²+42 +4) +8-4

Step 4:f(a) 4(+2) +4