In the next video you are shown how to work with rational (fractional) indices using the rule.

Formulae to remember:

  • {{x^{\tfrac{1}{n}}} = \sqrt[n]{x}}
  • {{x^{\tfrac{m}{n}}} = {{\left( {\sqrt[n]{x}} \right)}^m}}
  • {{x^{\tfrac{m}{n}}} = \sqrt[n]{{{x^m}}}}

Summary Exercise