This is proved here:
Quadratic irrational - Wikipedia, the free encyclopedia
Let , reduced. Then and so . So .b)let r be a rational number and a an integer such that r^n = a .Prove that r is an integer.
This is proved here:
Quadratic irrational - Wikipedia, the free encyclopedia
Let , reduced. Then and so . So .b)let r be a rational number and a an integer such that r^n = a .Prove that r is an integer.