Question

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

Answer 1

Coordinates x and y of vertex

`x = -b/(2a) = -8/4 = -2`

#y = f[-b/(2a)] = f(-2) = 2.(-2)^2 + 8.(-2) + 5 = = 8 - 16 + 5 = -3#