Solve.x2 + y2 - 2xy = 36x2 + y2 + 2xy = 196
A. (20, -8),(-20, -8), (-8, 20), (8, 20)
B. (10, -4), (-10, -4), (-4, 10), (4, 10)
C. (-4, 10), (-4, -10)
D. (10, 4), (-10, 4), (4, 10), (-4, 10)
Answer: D
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