From the equation of a parabola identify the focus and directrix: y^2 + 12x -6y + 21 = 0

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asked Nov 20, 2016 82.1k views

1 Answer

Sunil Gupta · Answer 1 · 2016-11-25T00:59:27+0000

y² + 12x - 6y + 21 = 0
- 21 - 21
y² + 12x - 6y = -21
12x + y² - 6y = -21
12x + (y² - 6y + 9) = -21 + 9
12x + (y - 3)² = -12
-12 -12 -12
-x + (y - 3)² = 1
-12

From the equation of a parabola identify the focus and directrix: y^2 + 12x -6y + 21 = 0

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