| ( a + b )2 | a2 + b2 + 2ab |
| (x + y + z)2 | x2 + y2 + z2 + 2xy + 2yz + 2xz |
| ( a – b )2 | a2 + b2 – 2ab |
| ( x – y + z )2 | x2 + y2 + z2 – 2xy – 2yz + 2xz |
| a2 – b2 | ( a + b ) ( a – b ) |
| ( x + y – z )2 | x2 + y2 + z2 + 2xy – 2yz – 2xz |
| ( a + b )3 | a3 + b3 + 3ab ( a + b ) |
| x3 + y3 | (x + y) (x2 – xy + y2) |
| x3 + y3 + z3 – 3xyz | (x + y + z)(x2 + y2 + z2 – xy – yz -xz) |
| ( a – b )3 | a3 – b3 – 3ab ( a – b) |
| x3 – y3 | (x – y) (x2 + xy + y2) |