section_path: Definition and notation/Cube roots
section_name: Cube roots
paragraph_text: Cube roots
  
  A cube root of a number x is a number r whose cube is x:
  
  r 3 = x. {\displaystyle r^{3}=x.}
  
  Every real number x has exactly one real cube root, written x 3 {\displaystyle {\sqrt{x}}}. For example,
  
  8 3 = 2 − 8 3 = − 2. {\displaystyle {\begin{aligned}{\sqrt{8}}&=2\\{\sqrt{-8}}&=-2.\end{aligned}}}
  
  Every real number has two additional complex cube roots.