2x+8x^2=0.................
2х(1+4х)=0 2х=0 или 4х+1=0 х=0 4х= -1 х= -1/4 Ответ: -1/4; 0.
2х+8х^2=0, 8х^2=-2х, 4х=-1, х=-1/4.