Description: The square of 7 is 49. (Contributed by SN, 26-Aug-2025)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | sq7 | |- ( 7 ^ 2 ) = ; 4 9 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 7cn | |- 7 e. CC |
|
| 2 | 1 | sqvali | |- ( 7 ^ 2 ) = ( 7 x. 7 ) |
| 3 | 7t7e49 | |- ( 7 x. 7 ) = ; 4 9 |
|
| 4 | 2 3 | eqtri | |- ( 7 ^ 2 ) = ; 4 9 |