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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 4)
Expand (x + 7)(x - 7)
x² + 49
x² - 49
x² + 14x + 49
x² - 14x + 49
Forklaring
(x + 7)(x - 7) = x² -7x +7x -49 = x² - 49
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