expand and simplify (2x+y)³ - (2x-y)³
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Step-by-step explanation:
since, a³ -b³= (a-b)(a²+ab+b²)
therefore, (2x+y)³ -(2x-y)³ = (2x+y-2x+y)(4x²+y²+4xy+4x²-y²+4x²+y²-4xy)
=y²(12x²+y²)
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