Check sibling questions

Ex 14.2, 5 (ii) - Factorise q^2 - 10q + 21  - Chapter 14 Class 8 NCERT


Transcript

Ex 14.2, 5 Factorise the following expressions. (ii) 𝑞^2 – 10q + 21 𝑞^2 – 10q + 21 By middle term splitting = 𝑞^2−3𝑞−7𝑞+21 = (𝑞^2−3𝑞)−(7𝑞−21) = q (q − 3) − 7(q − 3) Taking (q − 3) common, = (q − 3) (q − 7) Splitting the middle term We need to find two numbers whose Sum = −10 Product = 21 So, we write −10q = −3q − 7q

Davneet Singh's photo - Teacher, Engineer, Marketer

Article by

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.