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(6a - 7b)3

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Answer

Using the formula,

[∵ (x - y)3 = x3 - y3 - 3x2y + 3xy2]

So,

⇒ (6a - 7b)3 = (6a)3 - (7b)3 - 3 ×\times (6a)2 ×\times (7b) + 3 ×\times(6a) ×\times (7b)2

= 216a3 - 343b3 - 756a2b + 882ab2

Hence, (6a - 7b)3 = 216a3 - 343b3 - 756a2b + 882ab2.

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