X is an unknown number.
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x3 + 8 = x3 + 23 = (x + 2)[x2 - (x)(2) + 22] = (x + 2) (x2 - 2x + 4)
x3 + 1 = x3 + x2 - x2 - x + x + 1 = x2(x + 1) - x(x + 1) +1(x + 1) = (x + 1)(x2 - x + 1)
x3 - 3x2 + x - 3 = (x2 +1)( x - 3)
x3 - 12x2 + 35x = x(x2 - 12x + 35) = x(x - 5)(x - 7)
147x3 = 441 x3 = 441/147 x3 = 3 x = 31/3 x ≈ 1.4