Question

Using identity find the value of 2.1×2.2

Answer 1

Answer:

= (2 + 0.1) × (2 + 0.2)

= (2)^2 + (0.1 + 0.2) × 2 + ( 0.1) × (0.2)

= 4 + 0.6 + 0.02

= 4 + 0.62

= 4.62

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