Let's first rewrite it in vertex form. Start by completing the square. y = x² + 4x + 4 - 4 - 1 y = (x + 2)² - 5 (x + 2)² = y + 5
Now, 4a = 1; a =
So, the vertex form is (x + 2)² = 4()(y + 5) So, we know that the vertex is at (-2, -5). Since it's a concave up parabola, we just have to change the y-value to find the focus.