Quadraric equations pls help

3(x+7/3)^2= 1

3(x + 7/3)^2 = 1

(x + 7/3)^2 = 1/3

x + 7/3 = ± √(1/3)

x + 7/3 = ± 1 / √3

x + 7/3 = ± √3 / 3

x = (-7 ± √3) / 3

(3x+7)^2=3;
9x^2+46+42x=0