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Example 22 - Write the following cubes in expanded form - Identity VI & VII

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Example 22 Write the following cubes in the expanded form: (3a + 4b)3 (3a + 4b)3 Using (x + y)3 = x3 + y3 + 3xy(x + y) Where x = 3a & y = 4b = (3a)3 + (4b)3 + 3(3a)(4b)(3a + 4b) = 27a3 + 64b3 + 3(3a)(4b)(3a) + 3(3a)(4b) (4b) = 27a3 + 64b3 + 108a2b + 144ab2

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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.