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Answer:
[tex]4(x^{2} -4)^{2} -76[/tex]
Step-by-step explanation:
Take out 4:
4(x^2-8x)-12
=4(x^2-8x+16-16)-12
=4(x^2-8x+16)-64-12
=4(x^2-4)^2 - 76
=[tex]4(x^{2} -4)^{2} -76[/tex]