1) (-√39+√57)^2 = (9√3+√3)^2 = 10√3^2 = 3030 / 16-√247 = 30 / 16 - 7√3 = 30 / 16 - 7√3
2) (3√3+√69)^2 = (3√3+3√3)^2 = 6√696√69 / 16+3√23 = 6√69 / 16 + 6√23
3) (8√18)^2 = 144144 / 128 = 9/8
1) (-√39+√57)^2 = (9√3+√3)^2 = 10√3^2 = 30
30 / 16-√247 = 30 / 16 - 7√3 = 30 / 16 - 7√3
2) (3√3+√69)^2 = (3√3+3√3)^2 = 6√69
6√69 / 16+3√23 = 6√69 / 16 + 6√23
3) (8√18)^2 = 144
144 / 128 = 9/8