In Exercises 49–56, identify each equation without completing the square.y^2 - 4x + 2y + 21 = 0

In Exercises 35–42, find the vertex, focus, and directrix of each parabola with the given equation. Then graph the parabola.(y + 1)^2 = - 8x

In Exercises 43–48, convert each equation to standard form by completing the square on x or y. Then find the vertex, focus, and directrix of the parabola. Finally, graph the parabola.x^2 - 2x - 4y + 9 =0

In Exercises 43–48, convert each equation to standard form by completing the square on x or y. Then find the vertex, focus, and directrix of the parabola. Finally, graph the parabola.y^2 - 2y + 12x - 35 = 0

In Exercises 43–48, convert each equation to standard form by completing the square on x or y. Then find the vertex, focus, and directrix of the parabola. Finally, graph the parabola.x^2 + 6x - 4y + 1 = 0

In Exercises 57–62, use the vertex and the direction in which the parabola opens to determine the relation's domain and range. Is the relation a function?y^2 + 6y - x + 5 = 0

In Exercises 57–62, use the vertex and the direction in which the parabola opens to determine the relation's domain and range. Is the relation a function?y^2 + 6y - x + 5 = 0

In Exercises 57–62, use the vertex and the direction in which the parabola opens to determine the relation's domain and range. Is the relation a function?y = - x^2 + 4x - 3

In Exercises 57–62, use the vertex and the direction in which the parabola opens to determine the relation's domain and range. Is the relation a function?y = - x^2 + 4x - 3