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Mathematics for IGCSE & O level - Equations (Section 6 - No. 32)

If the equation is x² - 16 = 0, what are the roots?
4
-4
4 and -4
8 and -8

Paskaidrojums

Factoring leads to (x-4)(x+4) = 0, so x = 4 or x = -4.

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