3. (a) (7 pts) Find an equation of the plane containing A = (2, 1, -1), B = (1, -1, 2), and C = (4,0,
3. (a) (7 pts) Find an equation of the plane containing A = (2, 1, -1), B = (1, -1, 2), and C = (4,0, -1). Give your answer in the form ax + by + cz = d. (b) (2 pts) Let D be any point on the line through A and B. Find, with justification, AD . (AB x AC)
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