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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 24)

Consider the expression x² + 6x + 8. What are the two numbers that multiply to 8 and add to 6?
4 and 2
-4 and -2
8 and 1
-8 and -1

Explicació

4 * 2 = 8, and 4 + 2 = 6.

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