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  1. Chapter 14 Class 8 Factorisation
  2. Serial order wise

Transcript

Ex 14.2, 3 (Method 1) Factorise the expressions. (ii) 7ใ€–๐‘ ใ€—^2 + 21๐‘ž^2 7ใ€–p ใ€—^2 = 7 ร— ใ€–p ใ€—^2 = 7 ร— p ร— p 21๐‘ž^2 = 21 ร— ๐‘ž^2 = 3 ร— 7 ร— q ร— q So, 7 is the only common factor. 7ใ€–๐‘ ใ€—^2 + 21๐‘ž^2 = (7 ร— p ร— p) + (3 ร— 7 ร— q ร— q) Taking 7 Common, = 7 ร— ((p ร— p) + (3 ร— q ร— q)) = 7 ร— (p^2 + 3q^2) = 7 (๐’‘^๐Ÿ + 3๐’’^๐Ÿ) Ex 14.2, 3 (Method 2) Factorise the expressions. (ii) 7ใ€–๐‘ ใ€—^2 + 21๐‘ž^2 7ใ€–p ใ€—^2 + 21q^2 = 7ใ€–p ใ€—^2 + (7 ร— 3) ใ€–q ใ€—^2 Taking 7 Common, = 7 (๐’‘^๐Ÿ + 3๐’’^๐Ÿ)

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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.