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Anonymous
x3 + x2 - x - 1 = x2(x+1) - 1(x+1) =(x+1)(x2-1) = (x+1)(x+1)(x-1)
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(x - 1)(2x^2-1)
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The answer is (2x^2+3)(4x+1)
x is approximately 0.7549
4x(4x^2 + 3x + 1)