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Ex 12.1, 2 (Method 1) Factorise the following expressions. (iii) 7𝑎^2 + 14a7𝑎^2 + 14a = 7𝑎^2 + (7 × 2) a = (7a × a) + (7a × 2) Taking 7a common, = 7a (a + 2) Ex 12.1, 2 (Method 2) Factorise the following expressions. (iii) 7𝑎^2 + 14a7𝑎^2 + 14a 7𝒂^𝟐 = 7 × 𝑎^2 = 7 × a × a 14a = 14 × a = 7 × 2 × a So, 7 and a are the common factors. 7𝑎^2 + 14a = (7 × a × a) + (2 × 7 × a) = (7 × a) (a + 2) = 7a (a + 2)

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.