11. (1-a) x (1+a)
13. (r-p) x (r+p)
15. (a-2b) x (a+2b)
17. (5-x) x (5+x)
19. (6-m) x (6+m)
21. 8 (2x-y) x (2x+y)
23. (p-10) x (p+10)
25. (30-y) x (30+y)
27. 2 (2m-n) x (2m+n)
29. (4m-3n) x ( 4m +3n)
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Answers & Comments
11. (1-a) x (1+a)
13. (r-p) x (r+p)
15. (a-2b) x (a+2b)
17. (5-x) x (5+x)
19. (6-m) x (6+m)
21. 8 (2x-y) x (2x+y)
23. (p-10) x (p+10)
25. (30-y) x (30+y)
27. 2 (2m-n) x (2m+n)
29. (4m-3n) x ( 4m +3n)