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1. $x^{2} - 6$

A. -3
B. -3
C. -3
D. -3

Answer: Option A

Explanation:

(x + 3) - (x - 3) = x^{2} - 3 x + 3 x - 9 = x^{2} - 9 = 6 - 9 = - 3

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