expand using appropriate identity
(9x-2y)³
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Step-by-step explanation:
(a-b)³=a³-3a²b+3ab²-b³
(9x-2y)³=729x³-3(81x²2y)+39x4y²-8x³
= 729x³-486x²y+156xy²-8x³
=721x³-486x²y+156xy²
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