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2009-12-02T17:45:32+01:00
3(m+1)(n-2)+2(n+1)(m-2) = 3(mn-2m+2n-2)+2(nm-2n+m-2) = 3mn-6m+6n-6+2nm-4n+2m-4 = 5nm-4m+2n-10

x(x+1)(x+2)-x(x-1)(x-2) = x(x²+2x+x+2)-x(x²-2x-x+2) = x³+2x²+x²+2x-x³+2x²+x²-2x = 6x²