(x-5)^2 -16=0

1.(x-5)^2 -16=0
2.(x+8)^2=121
3.x^2+8x+16=0
4.4x^2-12x=-9
5. (7x-4)^2-(2x+1)^2
6.49(y-4)^2-9(y+2)^2