# How does (log algebra)

1. Jul 29, 2008

### franky2727

half way through a question and i'm stumped, ive got all the answers and i'm just revising so the answers no problem just dont get how the integral of {(2/2-z) + (2/1+2z)}dz become -2ln|2-z|+ln|1+2z| +c

2. Jul 29, 2008

### Dick

Do the two terms separately. For 2/(2-z) use the u substitution u=2-z. What substitution would you use for the second term?