(x + 5) (x – 5)
(a - 1)^2 – (m - 2)^2
25x^2 - 40x + 16
(a – x)^2 – 16
9 x^2 – 4
x^2 + 4x + 4
(x + 2)^2
(5x - 4)^2
(a – x + 4) (a – x - 4)
(a + m - 3) (a – m + 1)
x^2 - 25
(3x + 2) (3x - 2)
