Question: Let K be the cone, given by z = x2 + y2. a) Find an equation of each plane tangent to K. which is perpendicular

Let K be the cone, given by z = √x2 + y2.
a) Find an equation of each plane tangent to K. which is perpendicular to the plane x + z = 5.
b) Find an equation of each plane tangent to K, which is parallel to the plane x - y + z = I.

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