Phương trình log(x+1)=2 có nghiệm là A x=9 B x=11 C x=99 D x=101

1. **Rewrite in exponential form:** The equation $log(x+1) = 2$ is equivalent to $x+1 = 10^2$.<br />2. **Solve for x:** This simplifies to $x+1 = 100$, so $x = 99$.<br /><br />**Therefore, the correct answer is C: x = 99.** <br />