Giải các phương trình sau :
1. \(x^4-7x^3+6x^2+14x+4=0\)
2. \(2\left(2x^2+3x+3\right)^2+6x^2+8x+12=0\)
3. \(\left(2x^2-5x+1\right)^2-10x^2+24x-4=0\)
4. \(\left(2x+1\right)\left(2x-3\right)\left(2x-2\right)\left(2x+6\right)=100\)
5. \(\left(2x+1\right)\left(2x-3\right)\left(2x-2\right)\left(2x+6\right)=\left(x+6\right)^2\)