SOLUTION: Find the equation of the directrix of the parabola (x+2)� = -16(y-3)

Question 1023889: Find the equation of the directrix of the parabola (x+2)� = -16(y-3)

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
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this is general form of your parabola:
so, the vertex is at (, )
The coefficient of the unsquared part is , and this is also the value of , so .
Since the part is squared and is , then this is a regular parabola that opens . This means that the , being on the outside of the parabola, is units the vertex; so, the equation of the directrix of the parabola is .

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