Question

Where is the vertex of the parabola?

y = x2 + 2x + 1


Above the x-axis
Below the x-axis
On the x-axis
On the y-axis

Answer 1

Three ways to find out:
1. Graph it: http://www.desmos.com
2. Put it in vertex form: y = a(x - h)^2 + k
3. Find the x coordinate of the vertex using x = (-b)/(2a), then insert that value of x into x^2 + 2x + 1 to find y.

Answer 2

Remember, the vertex is the lowest point or highest point of the parabola.