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2x²-6x-2x+6<x²-4x-3x+12
2x²-8x+6<x²-7x+12 /-x²
x²-8x+6<-7x+12 /+7x
x²-x+6<12 /-6
x²-x<6 /pierwiastek
-x<pierwiastek z 6 /razy -1
x<-pierwiastek z 6
2) (3x-1)(x+2)>(x-3)(2x-1)
3x²+6x-x-2>2x²-x-6x+3
3x²+5x-2>2x²-7x+3 /-2x²
x²+5x-2>-7x+3 /+2
x²+5x>-7x+5 /+7x
x²+13x>5 /pierwiastek
13x>pierwiastek z 5 /:13
x>pierwiastek z 5 :13