Question

evaluate , using identities 992
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Answer 1

Answer:

Step-by-step explanation:

99²=(99)(99)=(100-1)(100-1)=(100-1)²=100²+1²-2(100)(1)=10000+1-200=9801

Answer 2

Step-by-step explanation:

992 = (100-1)2

= (100)2+(1)2-2×100×1

10000 +1 -200

10001-200

= 9801