Description: Factor the difference of two squares. (Contributed by NM, 7-Feb-2005)
Ref | Expression | ||
---|---|---|---|
Hypotheses | binom2.1 | |
|
binom2.2 | |
||
Assertion | subsqi | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | binom2.1 | |
|
2 | binom2.2 | |
|
3 | subsq | |
|
4 | 1 2 3 | mp2an | |