for the equation: (y + 5)2 = -12(x - 2); identify directrixQuestion 5Select one:x = 5y = -5y = 5x = 2Clear my choice◄ weekend sheet t3 w8Jump to...
Question
For the equation:
Identify directrix
Question 5 Select one:
- x = 5
- y = -5
- y = 5
- x = 2
Clear my choice ◄ weekend sheet t3 w8 Jump to...
Solution
The given equation is in the form of a parabola equation (y-k)^2 = 4a(x-h), where (h,k) is the vertex of the parabola, and 'a' is the distance from the vertex to the focus and the directrix.
The equation can be rewritten as (y + 5)^2 = -12(x - 2).
Here, the 'a' value is -3 (since 4a = -12), and the vertex (h,k) is (2,-5).
Since the 'a' value is negative, the parabola opens to the left.
The directrix of a parabola is a line that is a distance 'a' units from the vertex, and is perpendicular to the axis of symmetry.
For a parabola that opens to the left or right, the directrix is a vertical line (of the form x = constant).
Since the parabola opens to the left and the vertex is at x = 2, the directrix is a distance 'a' units to the right of the vertex, which is at x = 2 + (-3) = -1.
So, the directrix is x = -1.
However, this option is not given in your choices. Please check the equation or the choices again.
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