Tìm x biết: 1) (x-3)^2 - 4 = 0, 2) (2x-1)^2 + (x+3)^2 - 5(x+7)(x-7) = 0, 3) x^2 - 2x =24, 4) (5x+1)^2 - (5x+3)(5x-3) = 30

Tìm x
1) (x-3)^2-4=0
2) (2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
3) x^2 - 2x=24
4) (5x+1)^2-(5x+3)(5x-3)=30