Difference of Two Squares
__1. x2-1A. (x-12)(x+12)
__2. x2-9B. (x-1)(x+1)
__3. x2-36C. (x-11)(x+11)
__4. x2-49D. (x-3)(x+3)
__5. x2-64E. (x-7)(x+7)
__6. x2-81F. (x-10)(x+10)
__7. x2-100G. (x-13)(x+13)
__8. x2-121H. (x-9)(x+9)
__9. x2-144I. (x-6)(x+6)
__10. x2-169J. (x-8)(x+8)
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