Question

What is the vertex of y=x^2+2x-1

Answer 1

x-coordinate of vertex = -b/2a

b = 2, a = 1

-b/2a = -2/2 = -1

Plug in x = -1 into equation

y = (-1)^2 + 2(-1)-1 = 1 - 2 -1 = -2

Vertex is (-1, -2)