Where is the vertex of the parabola?

y = x2 + 2x + 3

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

Question

Where is the vertex of the parabola?

y = x2 + 2x + 3

       Above the x-axis
       Below the x-axis
       On the x-axis
       On the y-axis

campbell_st · Answer

well you can just complete the square or find the line of symmetry... 

which do you understand better...?

campbell_st · Answer

you can also use the discriminant... if you know about that...

ryguy · Answer

parabolas have vertexes?

campbell_st · Answer

or wait for someone to give the answer

campbell_st · Answer

they sure do

campbell_st · Answer

they also have a focus and a latus rectum

anonymous · Answer

you guys are so sassy on here.  just give me a moment.

campbell_st · Answer

lol... sorry...

whpalmer4 · Answer

Here I thought they LIKED sassy...

anonymous · Answer

lol it's fine, and @whpalmer4 i don't think anyone likes sassy when their doing their hw. :P

perhaps you guys can tell me if this is right. 
so the vertex is (-1,2) so that means "Above the x-axis?"

anonymous · Answer

hmm its right, pat myself on the back

whpalmer4 · Answer

Yes, you can quickly get the vertex from $$x = -\frac{b}{2a}$$and $$y = c-\frac{b^2}{4a}$$

whpalmer4 · Answer

I had a string of sassy math teachers.  Wouldn't have had it any other way.

anonymous · Answer

haha, different strokes for different folks, i suppose. ty