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: (y + 5)2 = -12(x - 2); identify directrixQuestion 5Select one:x = 5y = -5y = 5x = 2Clear my choice◄ weekend sheet t3 w8Jump to...
Solution
The given equation is in the form of a parabola equation, which is (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).
Comparing this with the standard form, we can see that the vertex (h,k) is (2,-5) and 4a = -12.
So, a = -12/4 = -3.
The directrix of a parabola is a line parallel to the axis of symmetry of the parabola, located as far away from the vertex as the focus is.
Since the parabola opens to the left (because 'a' is negative), the directrix will be a vertical line (x = constant).
The directrix is given by the equation x = h + a.
Substituting the values of h and a, we get x = 2 - 3 = -1.
So, the directrix of the given parabola is x = -1.
None of the options provided in the question match this answer.
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