simplify : (x²-1)(x+1)(x+2)(x-4)
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(x²-1)(x+1)(x+2)(x-4)
=(x³+x²-x-1)(x²-4x+2x-8)
=(x³+x²-x-1)(x²-2x-8)
=(x⁵+x⁴-x³-x²-2x⁴-2x³+2x²+2x-8x³-8x²+8x+8)
=(x⁵-x⁴-11x³-5x²+10x+8)
Hope it helps you...
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