Example 18 - Chapter 2 Class 9 Polynomials
Last updated at May 29, 2018 by Teachoo
Transcript
Example 18 Factorize: 49a2 + 70ab + 25b2 49a2 + 70ab + 25b2 = 72 a2 + 70ab + 52 b2 = (7a)2 + 70ab + (5b)2 = (7a)2 + (5b)2 + 2(7a) (5b) Using Identity (x + y)2 = x2 + y2 + 2xy where x = 7a and y = 5b = (7a + 5b)2 = (7a + 5b) (7a + 5b) Example 18 Factorize: (ii) 25/4 x2 y2/9 25/4 x2 y2/9 = 5^2/2^2 x2 y2/3^2 = (5/2 )^2 (y/3)^2 Using identity (a + b) (a b) = a2 b2 Where a = 5/2x , b = /3 = (5/2 x+y/3) (5/2 x y/3)
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.