Question

Where is the vertex of the parabola?

y = x2 + 2x + 1

A.
Above the x-axis

B.
Below the x-axis

C.
On the x-axis

D.
On the y-axis

Answer 1

y = x^2 + 2x + 1
y = (x + 1)^2

y = (x - h)^2 + k
y = (x - -1)^2 + 0

Therefore, the vertex is at (h,k) = (-1,0) which means C is the correct answer.

Answer 2

Wait what??? IS it A or C??????

Answer 3

vjordillo, you did + 1 + 1 instead of + 1 - 1 and x^2 + 2x + 1 = (x+1)^2

Answer 4

SOOOOO IS IT A OR C?

Answer 5

It's C. I checked with software just now to see that I am right.