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

Transcript

Ex 14.1, 2 (Method 1) Factorise the following expressions. (v) 20 ๐‘™^2 m + 30 a l m 20 ๐‘™^2 m = 20 ร— ๐‘™^2 ร— m = 2 ร— 2 ร— 5 ร— ๐‘™^2 ร— m = 2 ร— 2 ร— 5 ร— l ร— l ร— m 30 alm = 30 ร— a ร— l ร— m = 2 ร— 3 ร— 5 ร— a ร— l ร— m So, 20 ๐‘™^2m = 2 ร— 2 ร— 5 ร— l ร— l ร— m 30 alm = 2 ร— 3 ร— 5 ร— a ร— l ร— m So, 2, 5, l and m are the common factors. Now, 20 ๐‘™^2m + 30 alm = (2 ร— 2 ร— 5 ร— l ร— l ร— m) + (2 ร— 3 ร— 5 ร— a ร— l ร— m) Taking 2 ร— 5 ร— l ร— m common = 2 ร— 5 ร— l ร— m (2 ร— l + 3 ร— a) = 10lm(2l + 3a) Ex 14.1, 2 (Method 2) Factorise the following expressions. (v) 20 ๐‘™^2 m + 30 a l m 20 ๐‘™^2 m + 30 a l m = (10 ร— 2) ๐‘™^2 m + (10 ร— 3) alm Taking 10 common, = 10 ร— (2๐‘™^2m + 3 alm) = 10 ร— ((2l ร— lm) + (3a ร— lm)) Taking lm common, = 10 ร— lm (2l + 3a) = 10lm (2l + 3a)

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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.