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vera_ewing
 one year ago
Precalculus question
vera_ewing
 one year ago
Precalculus question

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vera_ewing
 one year ago
Best ResponseYou've already chosen the best response.1@Directrix Help please!

Directrix
 one year ago
Best ResponseYou've already chosen the best response.1Sorry, my computer crashed, and I had to find my way back here. Look at the graph of y = x^2  7

Directrix
 one year ago
Best ResponseYou've already chosen the best response.1That 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.

vera_ewing
 one year ago
Best ResponseYou've already chosen the best response.1So how do we know which is symmetric?

Directrix
 one year ago
Best ResponseYou've already chosen the best response.1The parabola y = 1*x^2 + 0x 7 is symmetric about the line x = 0. Which option is that?

Directrix
 one year ago
Best ResponseYou've already chosen the best response.1No. The xaxis is horizontal.

vera_ewing
 one year ago
Best ResponseYou've already chosen the best response.1Oh so they y axis since it's vertical?

Directrix
 one year ago
Best ResponseYou've already chosen the best response.1Look at this picture.

Directrix
 one year ago
Best ResponseYou've already chosen the best response.1The yaxis because it has equation x = 0. Note on the picture that you could fold the parabola about the yaxis and the two parts would coincide.

vera_ewing
 one year ago
Best ResponseYou've already chosen the best response.1Ok thank you SO much!!
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