What is the axis of symmetry of the parabola given by the equation x = 8(y + 3)2 - 10?

Question

anonymous · Answer

y= -3 ??

anonymous · Answer

just wait and see what campbell has to say

anonymous · Answer

differentiate the equation of parabola with respect to y and equate dx/dy to 0 and get your answer

anonymous · Answer

i dont think she has done differentiating yet.

campbell_st · Answer

1st method

vertes is at (-10, -3) and the parabola is concave right

so axis of symmetry is y = -3

or 

The axis is symmetry if found using y = -b/2a   

the curve is a parabola which is concave right


the curve is    y=8y^2 + 48y + 62

then the axis of symmetry is y -48/(2*8)      y = -3

anonymous · Answer

yess I agree with campbell because his answer is same as mine, :D

anonymous · Answer

Differentiating would be the easiest way to arrive at the answer in my opinion. Campbell has dwelled into the longer way :D

anonymous · Answer

yes, but she is not at that level yet. And that way is not longer if you really understand it, you look at the equation and you figure out the axis of symmetry just from looking at the equation without any differentiation.

anonymous · Answer

Ok.  I was just pointing this as an alternate solution to the other people who can do differentiation :D