using identity 1. (99)² 2. (106)³
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1. (99)²
Sol. (100-1)²
=(100)²+1²-2(100)(1)
=10000+1-200
=10001-200
=9801
2. (106)²
Sol. (100+6)²
=(100)²+6²+2(100)(6)
=10000+36+1200
=11236
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