How do i know if a point is external or not Ex find equations of tangents from (3,0) to y x 2 x 3

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How do i know if a point is external or not  Ex  find equations of tangents from (3,0) to y x 2 x 3

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Question: How do i know if a point is external or not? Ex. find equations of tangents from (3,0) to y=x^2-x+3