Verified Answer :

\(1. (a-12)(a+12)\)
\(2. 2(a+9)(a-1)\)
\(3. (x^2-7)(x^2+3)\)
\(4. (6-xy)(6+xy)\)
\(5. (x+5)(x-5)\)
\(6. (5y+2x)(5y-2x)\)
\(7. 3x(3ax^2+6bx+8c)\)
\(8. (x^3-11)(x^3-11) or (x^3-11)^2\)
\(9. (x+1)(x+5)\)
\(10. (r+3)(r-3)\)

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