find the product using identity
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30.1
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αηsᴡᴇя :-
(909)²
(900 + 9)²
ʙʏ ᴜsɪɴɢ ɪᴅᴇɴᴛɪᴛᴜ - (ᴀ+ʙ)² = ᴀ² + 2ᴀʙ + ʙ²
(900)² + 2(900)(9) + 9²
810000 + 16200 + 81
= 826281
ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs
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