.Trying to solve this, not allowed to use polar form or Eulers.
Here is my work:
then I have to take the root of and that didnīt work very well.
Why? What's the problem? You'll have to do the same if you use the well-known formula for the roots of a quadratic equation: you need the square root of , so you can put:
, , so are the solutions.
I tried this too:
but then it is a equationsystem with two unknows and one x^3 term etc so that didnīt work either.
and here I am, any ideas?