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Find the directrix of the parabola with the equation y+3=(1/10)[(x+2)^2]
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well, 4p = 10 will help
?
the standard geometric equation for a parabola such as y=x^2, is of the form: 4py = x^2 ; there p is a distance that measures the difference from the vertex to the directrix, or the vertex to the focus
y = 1/10 x^2 10y = x^2 4p = 10 will help us define the distance we need to move from the vertex
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