State. by writing first four terms, the ...

State. by writing first four terms, the expansion of the following, where `|b| < |a|: (a + b)^-4`

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The correct Answer is:

`a^(-4)[1- (4b)/a + (10b^(2))/a^(2) - (20 b^(3))/a^(3)+ …]`

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