Question

evaluate the following by using identity - 1 (8.1)² ​

Answer 1

$1 - {8.1}^{2} = {1}^{2} - {8.1}^{2} \\ = (1 - 8.1)(1 + 8.1) \\ = ( - 8) \times 8.2 \\ = - 65.6$

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