| (x + y)2 = x2 + 2xy + y2 |
|
| (x - y)2 = x2 - 2xy + y2 |
x2 - y2 = (x + y)(x - y) |
| (x + y)3 = x3 + 3x2y + 3xy2
+ y3 |
x3 + y3 = (x + y)(x2 - xy + y2)
|
|
(x + 1)3 = x3 + 3x2 +
3x
+ 1
|
|
|
(x - y)3 = x3 - 3x2y + 3xy2 - y3
|
x3 - y3 = (x - y)(x2 + xy + y2)
|
| |
x3 - 1 = (x - y)(x2 + x + 1)
|
| (x + y)4 = x4 + 4x3y + 6x2y2
+ 4xy3 + y4
|
|
