Question

what is the vertex of y=x2+4x−1

Answer 1

Step-by-step explanation:

Vertex's x-coordinate = -b/2a = -4/2 = -2

Vertex's y-coordinate = (-2)² + 4(-2) - 1 = -5

Hence the vertex is (-2, -5).

Answer 2

Answer:

$vertex = (-2,-5)$

Step-by-step explanation:

$y=x^{2} +4x-1\\\\y=x^2+4x+4-4-1\\\\y=(x+2)^2-5$

for

$y=(x-h)^2+c\\\\vertex = (h,c)$

in our equation we have

$h=-2\\\\c=-5$

so the vertex is

$(-2,-5)$