Math, asked by mahatva, 1 year ago

( 8.9) square using identity evaluate


mahatva: please answer

Answers

Answered by Anurag19
227
(8.9)²
=  ( 9 - 0.1)²
= (9)² - 2(9)(0.1) + (0.1)²
= 81 - 1.8 + 0.01
= 81 - 1.79
= 79.21
Answered by sonyakhan9016
39

8.9 = (9 - 0.1)

8.9² = (9 - 0.1)²

Identity 2 --> (a - b)² = a² - 2ab + b²

Here, a = 9 & b = 0.1

(9 - 0.1)² = 9² - (2 × 9 × 0.1) + 0.1²

= 81 - (1.8) + 0.01

= 79.2 + 0.01

= 79.21

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