A Nice Math Algebraic Olympiad | x^3 = 27 find x?? 

Here's something worth memorizing. The roots of x^n = a^n are x_k =a w^k for k=0,1,...,k-1 and w = e^(2 pi i /n). w has unit magnitude and its powers lie equally spaced on a circle of radius 1.

thx

اما این را همه میدانند که ۳ به توان ۳ میشود ۲۷