1. -10x + x² + 25 = x² - 10x + 25 = (x-5)²
2. (11 + x) (11 - x) = 11² - x² = 121 - x²
3. (4x + 1)² = 16x² + 8X + 1
4. 49 - x² = (7 - x) (7 + x)
5. (x - 3)² = x² - 6x + 9
6. -0,25x + x² = -
x + x² = -x * (1-4x)
7. 9 - a³ = график (y = 9 - a³)
8. (3 + х)² = x² + 6x + 9
9. (0,16 + x) (x - 0,16) = x² - 0,16² = x² - (
)²
10. (x + 0,7)² = x² + 
x + 
11. (a + 4) (a² - 4a + 16) = a³ + 4³ = a³ + 64
12. n³ + 2 = график (y = n³ + 2 )
13. (x-7)² = x² + 14x + 49
14. -a² - 2ab - b² = -(a + b)²
15. 16y² - 24y + 9 = (4y - 3)²
16. (x + 7y)² = x² + 14xy + 49y²
17. -
+ y² = (y - 
)*(y + )
18. (x+2)² = x² + 4x + 4
19. 81x² + 36x + 4 = (9x + 2)²
20. (9x - 1)² = 81x² - 18x + 1
