Factorise: x² + 7x + 12.

(x + 3)(x + 4)

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

Explanation

Two numbers whose sum is 7 and whose product is 12 are 3 and 4, so x² + 3x + 4x + 12 = x(x + 3) + 4(x + 3) = (x + 3)(x + 4).