You are losing a solution. Converting the log to an exponential on the first step gives you:

3^{2} = (x - 1)^{2}

9 = (x - 1)^{2}

Remember that taking the square root results in both a plus and a minus answer so:

±3 = x - 1

So x = 4 or x = -2

William W.

11d

Kai N.

I see. Thank you! Just a quick question, at which step did it go wrong? And how so?12d