Question: If which point Q does the tangent (-2,0,1)at the point P (1,1,2) intersect the xy-plane? I have the result but I don't understand how the

 If which point Q does the tangent (-2,0,1)at the point P

If which point Q does the tangent (-2,0,1)at the point P (1,1,2) intersect the xy-plane? I have the result but I don't understand how the highlighted part is done.

(1,1,2) intersect the xy-plane? I have the result but I don't understand

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