Kak tolong bantu saya mengerjakan soal nomor 16 dan 17

16. x^2-1<=3x^2+x-2
2x^2+x-1>=0
(x+1)(2x-1)>=0
x<=-1 atau x>=1/2

17. misal u=akar(x), maka u^2=x
(3u^2-5u+4)/(u^2-1)<=2
[(3u^2-5u+4)-2(u^2-1)] / (x^2-1)<=0
(u^2-5u+6) / (u+1)(u-1) <=0
(u-2)(u-3) / (u+1)(u-1)<=0
-1<x<1 atau 2<=x<=3