# How do I use the vertex formula to determine the vertex of the graph for y=2x^2 + 8x + 5?

$x = - \frac{b}{2 a} = - \frac{8}{4} = - 2$
y = f[-b/(2a)] = f(-2) = 2.(-2)^2 + 8.(-2) + 5 = = 8 - 16 + 5 = -3