SOLUTION: 9x+5y^2=0 whats the directrix whats its focal diameter, whats directrix?

Question 980831: 9x+5y^2=0
whats the directrix
whats its focal diameter,
whats directrix?
Answer by josgarithmetic(39623) (Show Source): You can put this solution on YOUR website!
The formula for a horizontal parabola with vertex at the origin is . You can derive the formula using the definition of a parabola with the Distance Formula or you can find the derivation in a textbook.
|p| is how far is the vertex from either the directrix or the focus.

Your example is
.

Directrix relies on finding p.

The directrix will be on the convex side of the parabola, and because yours is convex to the right, vertex at (0,0), the directrix is .

The location of the focus is on the conCAVE side of the parabola, so focus is at (-9/20, 0). This may be helpful (?) in finding the "focal diameter".
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