High-growth stocks such as Tesla TSLA.O, Apple Inc AAPL.O, Alphabet Inc GOOGL.O and Amazon.com Inc AMZN.O gained between 1.8% and slightly over 3%. By Carolina Mandl Sept 9 (Reuters) - Wall Street's main indexes extended gains on Friday afternoon and were set to snap a three-week losing streak, as investors piled into technology and high-growth stocks ahead of key U.S. inflation data next week. Analysts said this week's market recovery is more related to previous overselling, as uncertainty remains high with regard to inflation and how aggressive the Federal Reserve will be in implementing interest rate hikes.