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AnilSinghBora
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Asked: 2021-08-08T04:14:04+05:30 In:

Write the following cubes in expanded form:(ii) (2a−3b)3 Q.6(2)

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Hello sir please give me the best way for solving the best way for solving the question of class 9th ncert math of Polynomials chapter of exercise 2.5 of math, I don’t know how to solve it please guide me for best solution Write the following cubes in expanded form:(ii) (2a−3b)3

best math ncert solutionexercise 2.5 ncertncert class 9th solutionpolynomials ncert
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    1. Guru

      Using identity,(x–y)3 = x3–y3–3xy(x–y)

      (2a−3b)3 = (2a)3−(3b)3–(3×2a×3b)(2a–3b)

      = 8a3–27b3–18ab(2a–3b)

      = 8a3–27b3–36a2b+54ab2

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