Identify the vertex for the graph of y = 2x2 + 8x − 3.

Vertex: (-2, -11)
Focus: ( -2 -87/8) 
Axis of Symmetry: x = -2
Directrix: y = -89/8

X / Y 
-4/ -3
-3/-9
-2/-11
-1/-9
0/-3

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?