simplify the following using the identify (a+b)²=a²+2ab+b² 22²
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22× 22
using identity ( a+b)×a+b =a×a+b×b +2ab
(20+2) (20+2)=20 ×20 +2×2+2×20×2
22 ×22 = 400+4+80
484=484
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