Разность квадратов.
Пример : (A-B) (A+B) = A^2 - B^2

(k+5) (k-5)
(m+6) (6-m)
(0.3-p) (0.3+p)
(2x-1) (2x+1)
(3p-k) (3p+k)
(7-p) (7+p)
(2c+1) (2c-1)
(3t-y) (y+3t)
(6x-5y) (6x+5y)
(4x+3y) (4x-3y)
(7p-2k) (7p+2k)
(8y-3p) (3p+8y)
(6x-2y) (5x+2y)
(7p+9q) (7p-9q)
(11x+12y) (11x-12y)
(0.1x+6) (0.1x-6)
(0.6p-2c) (0.6p+2c)
(1.3x+3y) (1.3x-3y)
(0.9-4y) (0.9+4y)
(5-0.8t) (5+0.8t)
(1.4b-6c) (1.4b+6c)