Using identities, evaluate 8.92

8.92 = (9.0 − 0.1)2 = (9.0)2 − 2(9.0) (0.1) + (0.1)2 [(a − b)2 = a2 − 2ab + b2 ] = 81 − 1.8 + 0.01 = 79.21

Using Identities, Evaluate 8.9square2

Using identities, evaluate 8.9²

8.9² = (9.0 − 0.1)²

= (9.0)² − 2(9.0) (0.1) + (0.1)² [(a − b)² = a² − 2ab + b² ]

= 81 − 1.8 + 0.01 = 79.21

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