Question

Please Help!!
Find focal width of parabola
-1/40 x^2=y

Answer 1

@zepdrix is 160 right?

Answer 2

@rebeccaxhawaii

Answer 3

@Zeronknight

Answer 4

Hint:- the focus for x^2 = 4ay is at (0.a)

Answer 5

this will be at (0, -something)

Answer 6

um would the answer be 40? @welshfella

Answer 7

@IrishBoy123

Answer 8

@AihberKhan please help!

Answer 9

the focuse is found by solving
4a = -40
a = -10
focus is at (0,-10)

Answer 10

i cant remember what the focal width is, to be honest

Answer 11

oh yeah me either! Im stuck between it being 40 or 160

Answer 12

@zepdrix pleaswe check my answer?

Answer 13

is the focal width 4 * 10?

Answer 14

http://math.stackexchange.com/questions/574688/what-is-the-focal-width-of-a-parabol

Answer 15

looks that way

Answer 16

@tkhunny is it 40?

Answer 17

@radar is it 40?

Answer 18

|4a| = 40 -- Done. Why are we still asking? Is there lingering doubt?