Question: (a) Show that the surfaces intersect at the given point (b) Show that the surfaces have perpendicular tangent planes at this point. x + y

(a) Show that the surfaces intersect at the given point

(b) Show that the surfaces have perpendicular tangent planes at this point.

x + y + z + 2x - 4y - 4z -

x + y + z + 2x - 4y - 4z - 12 = 0, 4x + y + 16z = 24, (1, -2, 1)

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