# Example 1 (ii) - Chapter 6 Class 8 Squares and Square Roots

Last updated at Aug. 31, 2021 by Teachoo

Last updated at Aug. 31, 2021 by Teachoo

Transcript

Example 1 Find the square of the following numbers without actual multiplication. (ii) 42 We know that 42 = 40 + 2 Now, 422 = 42 × 42 = (40 + 2) × (40 + 2) = 40 × (40 + 2) + 2 × (40 + 2) = 40 × 40 + (40 × 2) + (2 × 40) + 2 × 2 = 1600 + 80 + 80 + 4 = 1764

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.