What s the two closest whole numbers to 154

153 and 155 are the answer...what is this from?

We have that the directix is x=-4
this means the parabola opens left or right

if the vertex is to the left of the directix, then it opens to the left
if the vertex is to the right of the directix, then it opens to the right

see
(0,0) is vertex
x=-4 is directix
-4<0
vertex is to the right of directix
it opens to the right