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The parabola y^(2) =- 4ax passes thro...

The parabola `y^(2) =- 4ax ` passes through the point (-1,2) . Find the coordinates of its focus and length of latus rectum.

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Therefore, coordinates of focus of parabola (1) are (-a,0) = (-1, 0) and length of latus rectum is `|4a| = 4` units .
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