The LCM is x^2 - 1.
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x3 + 1 = x3 + x2 - x2 - x + x + 1 = x2(x + 1) - x(x + 1) +1(x + 1) = (x + 1)(x2 - x + 1)
x2 + 7x + 6 = (x + 6) (x + 1)
x2 + 7x - 8 = (x + 8)(x - 1)
4(x-1)2(x2+6x+8) and 10(x-1)(x+2)(X2+7x+10)
3x2 + 2x + 3 + x2 + x + 1 = 4x 2+ 3x + 4