Question

Focus of parabola x² + 2y + 6x = 0 is :

• A. (–3, 4)
• B. (–3, – 4)
• C. (3, – 4)
• D. (4, – 3)

Answer 1

Answer: (A)

(–3, 4)

Answer 2

x² + 6x + 9 = –2y + 9

(x + 3)² = –2$\left( y–\frac{9}{2} \right)$

4a = 2 ̃ a = $\frac{1}{2}$

focus º (–3, 4)