4 |
a |
a+2 |
a |
4-a2 |
a |
a |
a+2 |
(2+a)(2-a) |
a |
a |
a+2 |
4 |
a |
a |
a+2 |
4 |
a |
a |
a+2 |
a |
a+2 |
4 |
a+2 |
a2 |
a+2 |
4-a2 |
a+2 |
(2+a)(2-a) |
a+2 |
2 |
x2-1 |
x-1 |
1 |
x |
1 |
a |
1 |
b |
2x+4 |
x2-4x+4 |
x3+8 |
2x+4 |
1 |
x+2 |
1 |
x-2 |
2 |
x2+2x |
4xy |
x-y |
4xy |
x+y |
A.y2-x2 | B.x2-y2 | C.x2-4y2 | D.4x2-y2 |
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