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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. (iv) โ€“ 16z + 20 ๐‘ง^3 โˆ’16 z = โˆ’16 ร— z = โˆ’1 ร— 16 ร— z = โˆ’1 ร— 2 ร— 2 ร— 2 ร— 2 ร— z 20๐‘ง^3 = 20 ร— ๐‘ง^3 = 2 ร— 2 ร— 5 ร— z ร— z ร— z So, 2, 2 and z are the common factors. โˆ’16z +20๐‘ง^3 = (โˆ’1 ร— 2 ร— 2 ร— 2 ร— z) + (2 ร— 2 ร— 5 ร— z ร— z ร— z) Talking 2 ร— 2 ร— z common, = 2 ร— 2 ร— z ((โˆ’1 ร— 2 ร— 2) + (5 ร— z ร— z)) = 4z (โˆ’4 + 5๐’›^๐Ÿ) Ex 14.1, 2 (Method 2) Factorise the following expressions. (iv) โ€“ 16z + 20 ๐‘ง^3 โˆ’ 16z + 20๐‘ง^3 = (4 ร— โˆ’4) z + (4 ร— 5)๐‘ง^3 Taking 4 common, = 4 (โˆ’4z + 5๐‘ง^3) = 4 (โˆ’4 ร— z + 5๐‘ง^2 ร— z) Taking z common, = 4 ร— z (โˆ’4 + 5๐‘ง^2) = 4z (โˆ’4 + 5๐’›^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.