Evaluate: (9.7)² - (0.3)²

Solution:

Given, (9.7)² - (0.3)²

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

Here a = 9.7 and b = 0.3

(9.7)² - (0.3)² = (9.7 + 0.3)(9.7 - 0.3)

= (10)(9.4) = 94

✦ Try This: Evaluate : (18.7)² - (1.3)²

Given, (18.7)² - (1.3)²

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

(18.7)² - (1.3)² = (18.7 + 1.3)(18.7 - 1.3)

= (20)(17.4) = 348

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

NCERT Exemplar Class 8 Maths Chapter 7 Problem 86(xviii)

Evaluate: (9.7)² - (0.3)²

Summary:

Evaluating (9.7)² - (0.3)² we get, 94

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