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2x²-10<x²+9+x²-2x+2x-4
2x²-10<2x²+5 /+10
2x²<2x²+15 /-2x²
0<15
Myślę że pomogłam
2x²-10<x²+6x+9+x²-2x+2x-4
2x²-10<2x²+6x+5
-15<6x /:6
x> -2,5
2x²-10<x²+9+x²-2x+2x-4
2x²-x²-x²<-2x+2x+9-4+10
0<15