Solve the problem.  x + 2y - z = 6  3x + 2y + z = 10(x + 2y)2 - z2 = 12

A. {(4, 0, -2)}
B. {(5, 0, -3)}
C. {(4, 0, -3)}
D. {(5, 0, -2)}


Answer: A

Mathematics

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A.

B.

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