factorize a²(b+c) -(b+c)³
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a²(b+c) - (b+c)³
=a²b+ a²c -( b³ + c³ + 3b²c + 3bc²)
= a²b + a²c - b³ - c³ - 3b²c - 3bc²
=a²b -3b²c -b³ +a²c - 3bc²-c³
= b(a²-3bc - b²) +c(a²-3bc- c²)
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