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Mathematics 14 Online
OpenStudy (anonymous):

What is the directrix of the parabola given by the equation y = 1/44 x2? (1 point)

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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