Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 12)
What are the factors of x² + 7x + 12?
(x + 6)(x + 1)
(x + 3)(x + 4)
(x + 2)(x + 6)
(x + 1)(x + 12)
Explanation
The numbers that multiply to 12 and add to 7 are 3 and 4.
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