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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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Consider the cubic equation x^3-15x-4=0, which has real coefficients, and three real roots for its answers. If we apply Cardano's formula to this problem, using a=1, b=0, c=-15, d=-4, we find taking the square root of negative 109 in the resulting computation is required!


  Submitted: 2018-08-28 20:54:45;   Last Modified: 2018-08-28 21:01:42.

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