To long bantu jawab soal ini |9+2x| > |4x`|

(9+2x^2)>(4x)^2
81+36x+4x^2>16x^2
-12x^2+36x+81>0
-(12x^2-36x-81)>0
-(6x+9)(2x-9)>0
x= 9/6, 9/2

hp={ x<-9/6 atau x>9/2}