Simplify: 81 x^4-16 x^2+32 x-16/9 x^2-4 x+4. (a) 9 x^2+4 x-4 (b) 9 x^2-4 x-4 (c) 9 x^2-2 x-8 (d) ...

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Simplify: 81 x^4-16 x^2+32 x-16/9 x^2-4 x+4.
(a) 9 x^2+4 x-4
(b) 9 x^2-4 x-4
(c) 9 x^2-2 x-8
(d) 9 x^2+2 x-8

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