please answer my question I'll Mark as you brain list​

4.   12x²-7x+1=0

12x²-4x-3x+1=0

4x(3x-1)-1(3x-1)=0

3x-1=0 , 4x-1=0

x=1/3 , 1/4..........

6x²+5x-6

6x²-4x+9x6=0

2x(3x-2)+3(3x-2)=0

3x-2=0 , 2x+3=0

x=2/3   ,   -3/2...........

5. x³-2x²-x+2=0

x=2,-1,2.....