100 points! graph each function by addition of ordinates, i dont need you to graph i only need to find the key angles and points. y = 2x^2 + x - 1

X-intercepts: 0.5 and -1

Vertex - (-1/4, -9/8)

Step-by-step explanation:

Using factoring, we can get (2x-1) (x+1)

This gives us x-intercepts, .5 and -1

Vertex -

-b/2a

-1/4

Plug this into the equation and get -

(-1/4, -9/8)

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!