September 2018 1 28 Report
CALCULAR:

1) (x + 5)(x - 5)
2) (2x + 5)(2x - 5)
3) (5xy - 6)(5xy + 6)
4) (12 + 9ab)(12 – 9ab)
5) (3xyv - 4ab)(3xyv + 4ab)
6) (3ab2c - 4ad2)(3ab2c + 4ad2)
7) (2c + d + e)(2c + d - e)
8) (a + b + 5)(a + b - 5)
9) (a – b + 5)(a + b + 5)
10) (a2 - b2 - ab)(a2 + b2 + ab)
11) (10 + 2a + 3b)(10 – 2a - 3b)
12) (3 – x + y)(3 + x + y)
13) (a + b + 7)(a – b + 7)
14) a + 3)(a + 7)
15) (x + 8)(x - 5)
16) (m - 9)(m - 3)
17) (2x + 5)(2x + 4)
18) (7m - 6)(7m + 1)
19) (m2 + 8)(m2 - 2)
20) (a3 - 6)(a3 - 4)
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