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# Evaluate: (9.9)²

**Solution:**

Given, (9.9)² = (10 - 0.1)²

Using standard identity: (a - b)² = a² - 2ab + b²

Here, a = 10 and b = 0.1

(9.9)² = (10 - 0.1)²

= (10)² - 2 (10)(0.1) + (0.1)²

= 100 - 2 + 0.01 = 98.01

**✦ Try This: **Evaluate: (8.8)²

Given, (8.8)² = (10 - 1.2)²

Using standard identity: (a - b)² = a² - 2ab + b²

(8.8)² = (10 - 1.2)²

= (10)² - 2 (10)(1.2) + (1.2)²

= 100 - 24 + 1.44 = 77.44

**☛ Also Check: **NCERT Solutions for Class 8 Maths Chapter 9

**NCERT Exemplar Class 8 Maths Chapter 7 Problem 86(xiii)**

## Evaluate: (9.9)²

**Summary:**

Evaluating (9.9)² we get, 98.01

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