Question

What is the vertex of the graph of y = x2 + 4x-1

Answer 1

vertex = (- 2, - 5 )

Explanation:

Given a quadratic in standard form , y = ax² + bx + c : a ≠ 0

Then the x- coordinate of the vertex is

`x_(vertex)` = -
`(b)/(2a)`

y = x² + 4x - 1 ← is in standard form

with a = 1 and b = 4, thus

`x_(vertex)` = -
`(4)/(2)` = - 2

Substitute x = - 2 into y for corresponding value

y = (- 2)² + 4(- 2) - 1 = 4 - 8 - 1 = - 5

vertex = (- 2, - 5 )

Answer 2

big man just points here

Explanation: