Solve the inequality. Write the solution set in interval notation.(x2 - 49)(x2 - 1) > 0
A. (-?, -7) ? (-1, 1) ? (7, ?)
B. (-?, -7] ? [-1, 1] ? [7, ?)
C. [-7, -1] ? [1, 7]
D. (-7, -1) ? (1, 7)
Answer: A
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