4x^2+2x=0 take out the common factor then solve for x
The common factor is 2x:
2x(2x+1) = 0
So the solutions are:
2x = 0, which gives x=0
2x+1 = 0, which gives x=-1/2
2x(2x+1) = 0
So the solutions are:
2x = 0, which gives x=0
2x+1 = 0, which gives x=-1/2