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Mathematics for IGCSE & O level - Indices 2 (Section 1 - No. 33)
The expression (x
2
- 4) can be factored as:
(x - 2)(x - 2)
(x + 2)(x + 2)
(x - 2)(x + 2)
x(x-4)
解释
Difference of squares, (x
2
- 4) = (x - 2)(x + 2)
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