multiply 4a2 + 2ab + b²and 2a-b
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4a^2 + 2ab + b^2 × 2a - b
(8a^3 + 4a^2b + 2ab^2) ( 4a^2b + 2ab^2 + b^3 )
( 12a^5b + 2ab^2 ) ( 6a^3b^3 + b^3 )
( 14a^6b^3 ) ( 6a^3b^6 )
14a^6b^3 × 6a^3b^6
answer = 84 a^9 b^9
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