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## Homework Statement

Let x = third root of [root (108) + 10] - trird root of [root (108) - 10]. Show that x ^ 3 +6 x-20 = 0 from which to infer the value of x (is a small natural)

## The Attempt at a Solution

may can i have some ideas how to find this? i tryed to find the x but i dont know how with the roots..