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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 6)

In the expression x² - 7x + 10, what two numbers add to -7 and multiply to 10?
-5 and -2
5 and 2
10 and -1
-10 and 1

解释

-5 + -2 = -7 and (-5)*(-2) = 10

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