Ex2.5, 10 Factorise each of the following: (i) 27y3 + 125z3 27y3 + 125z3 = (3y)3 + (5z)3 From Ex 2.4,9 we know a3 + b3 = (a + b) (a2 – ab + b2) Where a = 3y , b = 5z = (3y + 5z) [ (3y)2 + (5z)2 – (3y) (5z)] = (3y + 5z) [ 9y2 + 25z2 – 15yz)

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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 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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