Question

evaluate the following using identities 5.9square .​

Answer 1

Answer:

Using the identity (a−b)²  =a²  +b²  −2ab

8.9²  =(9−0.1)²

= 9²  +0.1²  −2 × 9 × 0.1

= 81 + 0.01 − 1.8

= 79.21‬

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