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f'(x)=1/3*3x²+2x=x²+2x
y=m
a=0
lim_{x⇒-∞} f(x)=-∞
lim_{x⇒∞}f(x)=+∞
x²+2x=9
x(x+2)=0
x=0 v x=-2
Extrema lokalne:
f(0)=0 minimum
f(-2)=-8/3+4=4/3 max
Odp. m∈<0, 4/3>
m∈<0,4/3>