The value of (101)² - (99)² = ______?
- 380
- 400
- 420
- None of these
Explanation
Using difference of squares:
(101)² - (99)² = (101 + 99)(101 - 99)
= (200)(2)
= 400
Using difference of squares:
(101)² - (99)² = (101 + 99)(101 - 99)
= (200)(2)
= 400
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