Suma por diferencia (Baldor)
__1. (1-3ax)(3ax+1)A. x2-y2
__2. (2a-1)(1+2a)B. x4-a4
__3. (2m+9)(2m-9)C. a2-x2
__4. (a-x)(x+a)D. 4a2-1
__5. (a3-b2)(a3+b2)E. m2-n2
__6. (m-n)(m+n)F. 4m2-81
__7. (n-1)(n+1)G. 1-9a2x2
__8. (x+y)(x-y)H. n2-1
__9. (x2+a2)(x2-a2)I. a6-b4
__10. (y2-3y)(y2+3y)J. y4-9y2
__11. (1-8xy)(8xy+1)A. 1-64x2y2
__12. (3xa-5ym)(5ym+3xa)B. 36x4-m4x2
__13. (6x2-m2x)(6x2+m2x)C. a2m-b2n
__14. (am+bn)(am-bn)D. a2x-4b2x-2
__15. (ax-2bx-1)(2bx-1+ax)E. 9x2a-25y2m
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