Question

What is the vertex for the graph of
http://i.imgur.com/3PDS76d.png
(4,-1)
(1,-4)
(-1,4)
(-4,1)

Answer 1

anyone?

Answer 2

What value of x makes (x + 1) = 0 ?

Answer 3

@mikeshaw

Answer 4

-1?

Answer 5

Yes. If you look at - (x + 1)^2, then that expression maximizes when x = -1.

If you put a large number in for x, say 99, then - (x + 1)^2 becomes - (100)^2 which is seriously negative.

So, x = -1 is the x-coordinate of the vertex.

To get the y-coordinate, do
y - 4 = - ( -1 + 1) ^2

y - 4 = -(0)^2

y = ?

Answer 6

4?

Answer 7

Yes, so (-1,4) @mikeshaw

Answer 8

thank you