I have a few problems that I'm trying to understand. If anyone can assist me that would be greatly appreciated.

Solve by using square root property:

1) 3(x-4)^2 = 15

2) (3x-4)^2 = 8

Solve by completing the square:

3) 2x^2 - 7x + 3= 0

Solve using the Quadratic Formula:

4) 3x^2 - 3x - 4= 0

Thank you.