Question

(0.9)² using identities find​

Answer 1

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Answer 2

Step-by-step explanation:

using the identity (a-b)² = a²-2ab+b²,

(0.9)² = (1 - 0.1)² = 1² - 2×1×0.1 + 0.1²

= 1 - 0.2 + 0.01

= 1.01 - 0.2 = 0.81