Factorise x² + 7x + 12 and x² − 7x + 12.

(x + 3)(x + 4) and (x − 3)(x − 4)

No citable source has been recorded for this record. Treat it as practice material, not as fact.

Explanation

In both the factors of 12 are 3 and 4; only their signs differ, since both must be positive in the first and both negative in the second.