factorise : 6 ( x + 2y )³ + 8 ( x + 2y )²
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2(x+2y)²{3(x+2y) +4}
2(x+2y)² {3x+6y+4}
2(x²+2*2*x*y+4y²) (3x+6y+4)
(2x²+8xy+4y²) (3x+6y+4)
6x³+12x²y+8x²+24x²y+48xy²+32xy+12xy²+24y³+16y²
6x³+24y³+8x²+16y²+12x²y+24x²y+48xy²+12xy²+32xy
6x³+24y³+8x²+16y²+36x²y+60xy²+32xy
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