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C. Simplify the following:
5² - 2² =
16² - 9² =
(9+2)(9–2) =
(16+5)(16–5) =​

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Answer:

1. 5² - 2²

25 - 4

= 21

2. 16² - 9²

256 - 81

= 175

3. (9 + 2) × (9 - 2)

11 × 7

= 77

4. (16 + 5) × (16 - 5)

21 × 11

= 231

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