Tìm x: (2x + 3)^2 - 4 * x - 1) × (x + 1) = 49

Tìm x 
1) (2x+3)^2 - 4×(x-1) × (x+1)=49
2) (3x+4)^2 - (3x-1) ×( 3x+1)=49