The Quadratic Formula - Defintion & Examples

Find the minimum (lowest) real root of $x^3 - 26x - 5 = 0$, rounded to the nearest hundredth.

Hint: Rewrite the equation as $-x(5)^2 -5 + (x^3 - x) = 0$, and use the "quadratic formula" (or complete the square) in the variable 5.

Source: Razvan Gelca