Question

Pre-calculus question

Answer 1

@Directrix Help please!

Answer 2

Sorry, my computer crashed, and I had to find my way back here.

Look at the graph of y = x^2 - 7

Answer 3

That will give you some idea.

Algebraically, y = x^2 - 7 can be written as y = 1*x^2 + 0x -7.

The x coordinate of the vertex will give the line of symmetry using the formula,

x = -b/(2a) where b = 0 and a = 2*1.

So, x = 0.

Answer 4

Is x = 0 the y-axis

Answer 5

So how do we know which is symmetric?

Answer 6

The parabola y = 1*x^2 + 0x -7 is symmetric about the line x = 0.

Which option is that?

Answer 7

C. the x axis

Answer 8

No. The x-axis is horizontal.

Answer 9

Oh so they y axis since it's vertical?

Answer 10

Look at this picture.

Answer 11

The y-axis because it has equation x = 0.
Note on the picture that you could fold the parabola about the y-axis and the two parts would coincide.

Answer 12

Ok thank you SO much!!

Answer 13

You are welcome.