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

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

s3a · Answer

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.

anonymous · Answer

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

s3a · Answer

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

anonymous · Answer

SOOOOO IS IT A OR C?

s3a · Answer

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