\(\sqrt{25}+\sqrt{36}=5+6=11\). Roots of separate numbers cannot in general be added by putting their numbers under one root.

If \(11=\sqrt{61}\), then \(11^2\) would equal \(61\). But \(11^2=121\), so the claimed equality is false.

Answer

The left-hand side is \(11\), which is not \(\sqrt{61}\).