12. (x + 6) (x - 6) (x + 1) (x - 1) =
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Answer:
x⁴ - 37x² + 36
Step-by-step explanation:
= (x²-6²)(x²-1²)
= (x²-36)(x²-1)
= x⁴ + (-36-1)x² + (-36x-1)
= x⁴ - 37x² + 36
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