1) x^2 - y^2 = (x + y)(x - y2) c^-25 = (c^(-12.5) + c^(-12.5))(c^(-12.5) - c^(-12.5)3) 25 - a^2 = (5 + a)(5 - a4) m^2 - n^2 = (m + n)(m - n5) b^2 - 0.04 = (b + 0.2)(b - 0.26) n^2 - 4/9 = (n + 2/3)(n - 2/37) 100 - p^2 = (10 + p)(10 - p8) a^2 - 1 = (a + 1)(a - 19) 49 - b^2 = (7 + b)(7 - b10) m^2 - 400 = (m + 20)(m - 2011) 1.21 - x^2 = (1.1 + x)(1.1 - x12) 25/64 - p^2 = (5/8 + p)(5/8 - p)
1) x^2 - y^2 = (x + y)(x - y
2) c^-25 = (c^(-12.5) + c^(-12.5))(c^(-12.5) - c^(-12.5)
3) 25 - a^2 = (5 + a)(5 - a
4) m^2 - n^2 = (m + n)(m - n
5) b^2 - 0.04 = (b + 0.2)(b - 0.2
6) n^2 - 4/9 = (n + 2/3)(n - 2/3
7) 100 - p^2 = (10 + p)(10 - p
8) a^2 - 1 = (a + 1)(a - 1
9) 49 - b^2 = (7 + b)(7 - b
10) m^2 - 400 = (m + 20)(m - 20
11) 1.21 - x^2 = (1.1 + x)(1.1 - x
12) 25/64 - p^2 = (5/8 + p)(5/8 - p)