CK-12 Foundation
Ck 12: Algebra: Properties of Exponents Study Guide
This comprehensive study guide highlights the main terms and formulas needed to understand properties of exponents. Examples are included.
University of St. Andrews (UK)
University of St. Andrews: Nicholas Chuquet
This site from the University of St. Andrews provides a biography of mathematician Nicholas Chuquet, who was the first to use negative numbers as exponents and coefficients.