Question

square root n +10 = n +10

Answer 1

\[\sqrt{n+10} = n+10\]

Answer 2

Take square on both sides.

It will cancel out the radical. Leaving you with:
\[n+10 = (n+10)^2\]

Answer 3

Multiplying will give you:
n+10 = (n+10)(n+10)

Using FOIL:

n+10 = n^2 + 20n + 100

Can you solve now?