Question 1054473
.
Nine more than the cube of a number is the same as 81 times the number. Find the numbers.
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<pre>
{{{x^3 - 81x +9}}} = 0.
</pre>

{{{graph( 330, 330, -1.5, 1.5, -2.5, 2.5,
          x^3 - 81x +9
)}}}


Plot y = {{{x^3 - 81x +9}}}


There is no real rational roots.


The real root/roots is/are irrational.