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f(0)=-8
A=(0,-8)
x⁴ - 2x² - 8 = 0
x⁴ + 2x² - 4x² - 8 = 0
x²(x²+2) - 4(x²+2)=0
(x²+2)(x²-4)=0
(x+2)(x-2)=0
x=-2 v x=2
B=(-2, 0) , C=(2, 0)
b)
f(0)=1/(0+1)=1/1=1
A=(0,1)
1/(x²+1)≠0 dla kazdego x - wykres nie przecina osi OX.