Use the properties of logarithms to rewrite each equation and then solve. Check for extraneous roots. Homework Help ✎

1. log(x) + log(x + 21) = 2

2. 2log₄(x) − log₄(3) = 2

3. log₂(9x + 5) − log₂(x² − 1) = 2

4. log₇(x + 1) + log₇(x − 5) = 1