Posted by **Mason** on Monday, March 12, 2012 at 3:55pm.

For each point in a set of points, its distance from (3,4) is four times it's distance from (-5,2)

a. Find the equation

b. tell which conic section the graph will be.

- Math/conics -
**Steve**, Monday, March 12, 2012 at 5:12pm
let d1 = distance of (x,y) from (3,4)

d1^2 = (x-3)^2 + (y-4)^2

let d2 = distance from (-5,2)

d2^2 = (x+5)^2 + (y-2)^2

since d1 = 4*d2

d1^2 = 16*d2^2

(x-3)^2 + (y-4)^2 = 16[(x+5)^2 + (y-2)^2]

expand and collect terms to arrive at

(x+83/15)^2 + (y-28/15)^2 = 7234/15

Looks like a circle

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