Answer:
vertex = (- 1, - 4 )
Explanation:
Given a parabola in standard form
y = ax² + bx + c ( a ≠ 0 )
Then the x- coordinate of the vertex is
x = -

y = x² + 2x - 3 ← is in standard form
with a = 1, b = 2 , then
x = -
= - 1
Substitute x = - 1 into the equation for corresponding value of y
y = (- 1)² + 2(- 1) - 3 = 1 - 2 - 3 = - 4
vertex = (- 1, - 4 )