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4 March, 02:21

Multiply to find the expand form of each product (a b) ^2 (a b) ^3 (a b) ^4

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  1. 4 March, 04:07
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    (a + b) ^2 = (a + b) (a + b) = a^2 + ab + ab + b^2 = a^2 + 2ab + b^2

    (a + b) ^3 = (a + b) (a + b) (a + b) = (a + b) (a^2 + 2ab + b^2) = a^3 + 2a^2 b + ab^2 + a^2 b + 2ab^2 + b^3 = a^3 + 3a^2 b + 3ab^2 + b^3

    (a + b) ^4 = (a + b) (a + b) (a + b) (a + b) = (a + b) (a^3 + 3a^2 b + 3ab^2 + b^3) = a^4 + 3a^3 b + 3a^2 b^2 + ab^3 + a^3 b + 3a^2 b^2 + 3ab^3 + b^4 = a^4 + 4a^3 b + 6a^2 b^2 + 4ab^3 + b^4
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