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x⁴+6x²+9+6x²+18>16
x⁴+12x²>16-18-9
x²(x²+12)>-11
b) 5x³(x³-3)+4(x³+4)<31-7x⁶
5x⁹-15x³+4x³+16<31-7x⁶
5x⁹+7x⁶-11x³<15
x³(5x⁶+7x³-11)<15
Hm. Czy to są aby nierówności kwadratowe?
(x⁴+6x²+9)+6x²+18>16
x⁴+6x²+9+6x²+18>16
x⁴+12x²+27>16
x⁴+12x²>16-27
x⁴+12x²>-11
b) 5x³(x³-3)+4(x³+4)<31-7x⁶
5x⁹-15x³+4x³+16<31-7x⁶
5x⁹-15x³+4x³+7x⁶>31-16
5x⁹-11x³+7x⁶>15