Describe the graph of the function.

y = 9x^2 + 18x – 6

1.) The graph is a parabola with axis of symmetry at x = 1.
2.)The graph is a parabola with axis of symmetry at x = 9.
3.)The graph is a parabola with axis of symmetry at x = 6.
4.)The graph is a parabola with axis of symmetry at x = –1.

Question

Describe the graph of the function.

y = 9x^2 + 18x – 6
 	
	1.) The graph is a parabola with axis of symmetry at x = 1.
	2.)The graph is a parabola with axis of symmetry at x = 9.
	3.)The graph is a parabola with axis of symmetry at x = 6.
	4.)The graph is a parabola with axis of symmetry at x = –1.

sidsiddhartha · Answer

this is a second degree equation so its a parabola 
now first thing: try to make a square

anonymous · Answer

A square?

sidsiddhartha · Answer

yeah like this
$$y=9x ^{2}+18x-6$$
$$y=9(x ^{2}+2x-\frac{ 2 }{ 3})$$
$$y=9[(x+1)^{2}-5/3]$$

sidsiddhartha · Answer

now it is of the form
 y=A(x-h)^2+k, with (h.k) being the (x,y) coordinates of the vertex.

sidsiddhartha · Answer

axis of symmetry: x=A
here A=9
so ur axis of symmetry is x=9
do u get it?

anonymous · Answer

Yes I get it :)

sidsiddhartha · Answer

:)