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OpenStudy (anonymous):
What is the directrix of the parabola given by the equation y = 1/44 x2? (1 point)
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OpenStudy (anonymous):
help please
OpenStudy (amistre64):
one method is to equate this to the line y = 1/2x
OpenStudy (anonymous):
what do you mean @amistre64 ?
OpenStudy (amistre64):
|dw:1367414891537:dw| 1/44 x^2 = 1/2 x 1/22 x^2 = x 1/22 x = 1; x=22 2a = 22, when a=11
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