A parabola can be represented by the equation x2 = –20y. What are the coordinates of the focus of the parabola?

(–5,0)
(5,0)
(0,5)
(0,–5)

could you give more information?

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

180

step-by-step explanation: