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x²-4x+4+3x<x²+4x+4+2x-3
x²-x+4<x²+6x+1
-7x<-3 /:-7
x>3/7
2. 5(x-1)²-2(x+3)²=3(x+2)²-7(6x-1)
5x²-10x+5-2x²-12x-18=3x²+12x+12-42x+7
8x=32 /:8
x=4
zad.2
a) cena z 22% VAT - 22,57 zł - 122%x
cena netto - x
122%x = 22,57 zł /:122
1%x = 0,185 zł /*100
100%x= 18,50 zł
x=18,50 zł
b) cena netto - 18,50 zł - x
cena z 7% VAT - 107%x
x=18,50 zł /:100
1%x=0,185 zł /*107
107%x≈19,80 zł