E v a l u a t e   u sin g   s u i t a b l e   i d e n t i t i e s : ( a )   1001 2 ( b )   96 2 ( c )   127 × 127 - 73 × 73

Hi, We know that a±b2=a2+b2±2abso here 10012= 1000+12=10002+12+2×1000×1=1000000+1+2000=1002001 similarily962= 100-42=1002+42-2×100×4=10000+16-800=9216Also a2-b2=a-ba+b127×127-73×73=1272-732=127-73127+73=54×200=10800

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