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For this case we have the following polynomials:
 16x ^ 2 - 16
 -12x ^ 2 - 12x + 12
 Adding we have:
 (16x ^ 2 - 16) + (-12x ^ 2 - 12x + 12)
 We group in similar terms:
 x ^ 2 (16-12) + x (-12) + (-16 + 12)
 Rewriting we have:
 4x ^ 2 - 12x - 4
 
 4x ^ 2 - 12x - 4
 option A

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