Solve each of the following. Express irrational solutions in simplest radical form. If the equasion has no solution, write "no solution".

1. x^2 = 225

2. x^2 = -225

3. a^2 - 64 = 0

4. 3n^2 - 75 = 0

5. n^2 - 6 = 0

6. (n - 5)^2 = 20

If you can please help me solve these problems I'd be very greatful. Thanks for and help.