factorise 8x cube -(2 x- y) cube
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8x³ - (2x - y)³
= (2x)³ - (2x - y)³
= [(2x) - (2x - y)][(2x)² + (2x)(2x - y) + (2x - y)²]
= (2x - 2x - y)(4x² + 4x² - 2xy + 4x² - 4xy + y²)
= -y(12x² - 6xy + y²).
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