Mathematics for IGCSE & O level - Equations (Section 8 - No. 35)
What are the factors of the quadratic expression x² + 7x + 12?
(x + 3)(x + 4)
(x - 3)(x - 4)
(x - 6)(x + 2)
(x + 6)(x - 2)
Explicación
Find two numbers that multiply to 12 and add up to 7. Those numbers are 3 and 4.