4x2 − 25 = (2x + 5) · (2x - 5)
8a - 4b + 16c + 12d = - 4. (- 2a + b - 4c - 3d)
(x + 5)2 = x2 + 10x + 25
x2 + 8/3 x + 16/9 = (x + 4/3)2
36x4 - 48x6 - 72x3 + 60x5 = 12x3. (3x - 16x3 - 6 + 5x2)
x + x2 + 1/4 = (x + 1/2)2
x6 - 4 = (x3 + 2) · (x3 - 2)
-x2 + 4 = (2 - x) · (2 + x)
7x2 + 11x3 - 4x5 + 3x4 - x8 = x2. (7 + 11x - 4x3 + 3x2 - x6)
