Example 17 (ii) - Chapter 2 Class 9 Polynomials

Last updated at April 16, 2024 by

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Example 22 Write the following cubes in the expanded form: (ii) (5p – 3q)3 (5p – 3q)3 Using (x – y)3 = x3 – y3 – 3xy(x – y) Where x = 5p & y = 3q = (5p)3 – (3q)3 – 3(5p)(3q)(5p – 3q) = 125p3 – 27q3 – 3(5p)(3q)(5p) -3(5p)(3q) (– 3q) = 125p3 – 27q3 – 225p2q + 135pq2

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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 and Computer Science at Teachoo