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Mathematics for IGCSE & O level - Equations (Section 2 - No. 45)

What would be the result of the equation x² = 9 by using the method of "difference of two squares"?
x = 3
x = -3
x = 3 or -3
x = 9

Explication

x² - 9 = (x-3)(x+3) = 0

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