Example 1 (i) - Chapter 5 Class 8 Squares and Square Roots

Last updated at Dec. 16, 2024 by

Example 1 - Find square of 39 without actual multiplication - Teachoo - Examples

part 2 - Example 1 (i) - Examples - Serial order wise - Chapter 5 Class 8 Squares and Square Roots

 

 

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Example 1 (Method 1) Find the square of the following numbers without actual multiplication. (i) 39 We know that 39 = 40 − 1 Now, 392 = (40 − 1)2 = 402 + 12 − 2 × 40 × 1 = 1600 + 1 − 80 = 1601 − 80 = 1521 Example 1 (Method 2) Find the square of the following numbers without actual multiplication. (i) 39 We know that 39 = 30 + 9 Now, 392 = (30 + 9)2 = 302 + 92 + 2 × 30 × 9 = 900 + 81 + 540 = 1521

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo