Question

решите неравенство ✊
2х²-х-1≤0

Answer 1

В приложении .........

Answer 2

2x²-x-1<0
2x²+x-2x-1<0
x*(2x+1)-(2x+1)<0
(x-1)*(2x+1)<0
{x-1<0
{2x+1>0
{x-1>0
{2x+1<0

{x<1
{x>-1/2
{x>1
{x<-1/2

x є [-1/2, 1]