ಕೆಳಗಿನ ಉಕ್ತಿಯನ್ನು ಸರಳಗೊಳಿಸಿ.

49a2 + 70ab + 25b2

1
(5a + 7b)2
2
(5a - 7b)2
3
(7a - 5b)2
4
(7a + 5b)2

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