Which point is the vertex of the parabola y = x2+4x+1?
A. (-2, -3)
B. (2, 3)
C. (-2, 3)
D. (2, -3)

Question

Which point is the vertex of the parabola y = x2+4x+1?
	A.	(-2, -3)
	B.	(2, 3)
	C.	(-2, 3)
	D.	(2, -3)

anonymous · Answer

Agreed^

anonymous · Answer

thanks :P

hero · Answer

A only

anonymous · Answer

??

anonymous · Answer

how many vertices does this one poor quadratic have?

hero · Answer

satellite just post your solution

anonymous · Answer

dunno. pick all 4 because apparently there can be more than one

radar · Answer

Nah,vertex is singular, plural would be vertices lol

hero · Answer

Once again, that's not a solution sat

hero · Answer

I'm sticking with A = (-2,-3)

anonymous · Answer

I agree with Hero    (A)

anonymous · Answer

@belaski 
$$x=-\frac{b}{2a}=-\frac{4}{2\times 1}=-2$$is the first coordinate
second coordinate is 
$$(-2)^2+4(-2)+1=4-8+1=-3$$

anonymous · Answer

well your only suppose to chose 1

hero · Answer

satellite just didn't want to give me any credit

anonymous · Answer

so answer is 
$$(-2,-3)$$ trust me, i am a carnival barker

anonymous · Answer

ok well thanks guys

hero · Answer

Mancake, prove that your original answer is correct. Only then will I believe you to be a professor.

anonymous · Answer

I think prof. mancake is right

anonymous · Answer

I just used the same formulas and i got the same answers

anonymous · Answer

A. (-2, -3)

y = x2+4x+1
h = -4/2 = -2
k = (-2)^2 -4* 2 + 1 = -3