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64z²+2*24z+9+36z²+24z+4 < 100z²-1+8z+28
64z²+48z+9+36z²+24z+4 < 100z²-1+8z+28
100z²+72z+13 < 100z²+8z+27
72z-8z < 27-13
64z < 14 /:64
z < 14/64
z < 7/24
2) y+2/3 - y-2/2 ≥ 1-y
2/3-1 ≥ 1-y
-1/3-1 ≥ -y
-4/3 ≥ - y /*(-1)
4/3 ≤ y