Question

using a suitable identity evaluate 8.8^2
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Answer 1

Question:-

➡ Using suitable identity, evaluate (8.8)².

Solution:-

(8.8)²

= (9 - 0.2)²

= 9² + 0.2² - 2 × 9 × 0.2

= 81 + 0.04 - 3.6

= 81.04 - 3.6

= 77.44

Hence,

(8.8)² = 77.44

Answer:-

➡ (8.8)² = 7744

Identity Used:-

➡ (a - b)² = a² - 2ab + b²

Other Identities:-

➡ (a + b)² = a² + 2ab + b²

➡ a² - b² = (a + b)(a - b)

➡ a³ + b³ = (a + b)(a² - ab + b²)

➡ a³ - b³ = (a - b)(a² + ab + b²)