Tangents PQ 3: y=mx intersect y^2=x at P, tangent at P intersect x axis at Q. If area OPQ=4, find m?

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Tangents PQ 3: y=mx intersect y^2=x at P, tangent at P intersect x axis at Q. If area OPQ=4, find m? Support the channel:
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Sir i found the slope to be -1/2 cause i considered area as only positive
Can you please explain why have you considered area as both +4 and -4?

gerishsingh