The square root of (2722 − 1282) is :

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The square root of (272² − 128²) is :

1. 256
2. 200
3. 240
4. 144

Correct Option: C

? = √(272² − 128²)
= √(272 + 128)(272 − 128)
= √400 × 144
= 200 × 12 = 240