Math, asked by pikapikapikachuarmy, 9 days ago

evaluate using identities
(198) raised to 2

Answers

Answered by lalith2004ky
0

Answer:

 {198}^{2}   =  {(200 - 2)}^{2}  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  =  {200}^{2}  +  {2}^{2}  - 2(200)(2)  \\  = 4 0000 + 4 - 800 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  = 39200 + 4 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  = 39204 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:

The identity used is,

 {(a - b)}^{2}  =  {a  }^{2} +  {b}^{2} - 2ab

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